diff --git a/OpenSim/Framework/Monitoring/BaseStatsCollector.cs b/OpenSim/Framework/Monitoring/BaseStatsCollector.cs
index 96536e8e00..8c2bec6668 100644
--- a/OpenSim/Framework/Monitoring/BaseStatsCollector.cs
+++ b/OpenSim/Framework/Monitoring/BaseStatsCollector.cs
@@ -56,22 +56,25 @@ namespace OpenSim.Framework.Monitoring
                 Math.Round((MemoryWatchdog.AverageHeapAllocationRate * 1000) / 1024.0 / 1024, 3));
 
             Process myprocess = Process.GetCurrentProcess();
-            if (!myprocess.HasExited)
+//            if (!myprocess.HasExited)
+            try
             {
                 myprocess.Refresh();
                 sb.AppendFormat(
                         "Process memory:      Physical {0} MB \t Paged {1} MB \t Virtual {2} MB\n",
-                        Math.Round(Process.GetCurrentProcess().WorkingSet64 / 1024.0 / 1024.0),
-                        Math.Round(Process.GetCurrentProcess().PagedMemorySize64 / 1024.0 / 1024.0),
-                        Math.Round(Process.GetCurrentProcess().VirtualMemorySize64 / 1024.0 / 1024.0));
+                        Math.Round(myprocess.WorkingSet64 / 1024.0 / 1024.0),
+                        Math.Round(myprocess.PagedMemorySize64 / 1024.0 / 1024.0),
+                        Math.Round(myprocess.VirtualMemorySize64 / 1024.0 / 1024.0));
                 sb.AppendFormat(
                         "Peak process memory: Physical {0} MB \t Paged {1} MB \t Virtual {2} MB\n",
-                        Math.Round(Process.GetCurrentProcess().PeakWorkingSet64 / 1024.0 / 1024.0),
-                        Math.Round(Process.GetCurrentProcess().PeakPagedMemorySize64 / 1024.0 / 1024.0),
-                        Math.Round(Process.GetCurrentProcess().PeakVirtualMemorySize64 / 1024.0 / 1024.0));
+                        Math.Round(myprocess.PeakWorkingSet64 / 1024.0 / 1024.0),
+                        Math.Round(myprocess.PeakPagedMemorySize64 / 1024.0 / 1024.0),
+                        Math.Round(myprocess.PeakVirtualMemorySize64 / 1024.0 / 1024.0));
             }
-            else
-                sb.Append("Process reported as Exited \n");
+            catch
+            { }
+//            else
+//                sb.Append("Process reported as Exited \n");
 
             return sb.ToString();
         }
diff --git a/OpenSim/Framework/Monitoring/JobEngine.cs b/OpenSim/Framework/Monitoring/JobEngine.cs
index 6db9a67376..7709f629aa 100644
--- a/OpenSim/Framework/Monitoring/JobEngine.cs
+++ b/OpenSim/Framework/Monitoring/JobEngine.cs
@@ -40,6 +40,8 @@ namespace OpenSim.Framework.Monitoring
 
         public int LogLevel { get; set; }
 
+        private object JobLock = new object();
+
         public string Name { get; private set; }
 
         public string LoggingName { get; private set; }
@@ -76,7 +78,7 @@ namespace OpenSim.Framework.Monitoring
         /// </remarks>
         private bool m_warnOverMaxQueue = true;
 
-        private BlockingCollection<Job> m_jobQueue;
+        private BlockingCollection<Job> m_jobQueue = new BlockingCollection<Job>(new ConcurrentQueue<Job>(), 5000);
 
         private CancellationTokenSource m_cancelSource;
 
@@ -95,7 +97,7 @@ namespace OpenSim.Framework.Monitoring
 
         public void Start()
         {
-            lock (this)
+            lock (JobLock)
             {
                 if (IsRunning)
                     return;
@@ -104,7 +106,6 @@ namespace OpenSim.Framework.Monitoring
 
                 m_finishedProcessingAfterStop.Reset();
 
-                m_jobQueue = new BlockingCollection<Job>(new ConcurrentQueue<Job>(), 5000);
                 m_cancelSource = new CancellationTokenSource();
 
                 WorkManager.StartThread(
@@ -120,43 +121,22 @@ namespace OpenSim.Framework.Monitoring
 
         public void Stop()
         {   
-            lock (this)
+            lock (JobLock)
             {
                 try
                 {
                     if (!IsRunning)
                         return;
 
+                    m_log.DebugFormat("[JobEngine] Stopping {0}", Name);
+
                     IsRunning = false;
 
-                    int requestsLeft = m_jobQueue.Count;
-
-                    if (requestsLeft <= 0)
-                    {
+                    m_finishedProcessingAfterStop.Reset();
+                    if(m_jobQueue.Count <= 0)
                         m_cancelSource.Cancel();
-                    }
-                    else 
-                    {
-                        m_log.InfoFormat("[{0}]: Waiting to write {1} events after stop.", LoggingName, requestsLeft);
 
-                        while (requestsLeft > 0)
-                        {
-                            if (!m_finishedProcessingAfterStop.WaitOne(RequestProcessTimeoutOnStop))
-                            {
-                                // After timeout no events have been written
-                                if (requestsLeft == m_jobQueue.Count)
-                                {
-                                    m_log.WarnFormat(
-                                        "[{0}]: No requests processed after {1} ms wait.  Discarding remaining {2} requests", 
-                                        LoggingName, RequestProcessTimeoutOnStop, requestsLeft);
-
-                                    break;
-                                }
-                            }
-
-                            requestsLeft = m_jobQueue.Count;
-                        }
-                    }
+                    m_finishedProcessingAfterStop.WaitOne(RequestProcessTimeoutOnStop);
                 }
                 finally
                 {
@@ -245,48 +225,51 @@ namespace OpenSim.Framework.Monitoring
 
         private void ProcessRequests()
         {
-            try
+            while(IsRunning || m_jobQueue.Count > 0)
             {
-                while (IsRunning || m_jobQueue.Count > 0)
+                try
                 {
-                    try
-                    {
-                        CurrentJob = m_jobQueue.Take(m_cancelSource.Token);
-                    }
-                    catch (ObjectDisposedException e)
-                    {
-                        // If we see this whilst not running then it may be due to a race where this thread checks
-                        // IsRunning after the stopping thread sets it to false and disposes of the cancellation source.
-                        if (IsRunning)
-                            throw e;
-                        else
-                            break;
-                    }
-
-                    if (LogLevel >= 1)
-                        m_log.DebugFormat("[{0}]: Processing job {1}", LoggingName, CurrentJob.Name);
-
-                    try
-                    {
-                        CurrentJob.Action();
-                    }
-                    catch (Exception e)
-                    {
-                        m_log.Error(
-                            string.Format(
-                            "[{0}]: Job {1} failed, continuing.  Exception  ", LoggingName, CurrentJob.Name), e);
-                    }
-
-                    if (LogLevel >= 1)
-                        m_log.DebugFormat("[{0}]: Processed job {1}", LoggingName, CurrentJob.Name);
-
-                    CurrentJob = null;
+                    CurrentJob = m_jobQueue.Take(m_cancelSource.Token);
                 }
-            }
-            catch (OperationCanceledException)
-            {
+                catch(ObjectDisposedException e)
+                {
+                    // If we see this whilst not running then it may be due to a race where this thread checks
+                    // IsRunning after the stopping thread sets it to false and disposes of the cancellation source.
+                    if(IsRunning)
+                        throw e;
+                    else
+                    {
+                        m_log.DebugFormat("[JobEngine] {0} stopping ignoring {1} jobs in queue",
+                                Name,m_jobQueue.Count);
+                        break;
+                    }
+                }
+                catch(OperationCanceledException)
+                {
+                    break;
+                }
+
+                if(LogLevel >= 1)
+                    m_log.DebugFormat("[{0}]: Processing job {1}",LoggingName,CurrentJob.Name);
+
+                try
+                {
+                    CurrentJob.Action();
+                }
+                catch(Exception e)
+                {
+                    m_log.Error(
+                        string.Format(
+                        "[{0}]: Job {1} failed, continuing.  Exception  ",LoggingName,CurrentJob.Name),e);
+                }
+
+                if(LogLevel >= 1)
+                    m_log.DebugFormat("[{0}]: Processed job {1}",LoggingName,CurrentJob.Name);
+
+                CurrentJob = null;
             }
 
+            Watchdog.RemoveThread(false);
             m_finishedProcessingAfterStop.Set();
         }
 
@@ -338,4 +321,4 @@ namespace OpenSim.Framework.Monitoring
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Framework/Monitoring/Watchdog.cs b/OpenSim/Framework/Monitoring/Watchdog.cs
index 4485a9c501..b2c1fb178c 100644
--- a/OpenSim/Framework/Monitoring/Watchdog.cs
+++ b/OpenSim/Framework/Monitoring/Watchdog.cs
@@ -332,29 +332,31 @@ namespace OpenSim.Framework.Monitoring
             if (callback != null)
             {
                 List<ThreadWatchdogInfo> callbackInfos = null;
+                List<ThreadWatchdogInfo> threadsInfo;
 
                 lock (m_threads)
                 {
                     // get a copy since we may change m_threads
-                    List<ThreadWatchdogInfo> threadsInfo = m_threads.Values.ToList();
-                    foreach (ThreadWatchdogInfo threadInfo in threadsInfo)
+                    threadsInfo = m_threads.Values.ToList();
+
+                    foreach(ThreadWatchdogInfo threadInfo in threadsInfo)
                     {
-                        if (threadInfo.Thread.ThreadState == ThreadState.Stopped)
+                        if(threadInfo.Thread.ThreadState == ThreadState.Stopped)
                         {
                             RemoveThread(threadInfo.Thread.ManagedThreadId);
 
-                            if (callbackInfos == null)
+                            if(callbackInfos == null)
                                 callbackInfos = new List<ThreadWatchdogInfo>();
 
                             callbackInfos.Add(threadInfo);
                         }
-                        else if (!threadInfo.IsTimedOut && now - threadInfo.LastTick >= threadInfo.Timeout)
+                        else if(!threadInfo.IsTimedOut && now - threadInfo.LastTick >= threadInfo.Timeout)
                         {
                             threadInfo.IsTimedOut = true;
 
-                            if (threadInfo.AlarmIfTimeout)
+                            if(threadInfo.AlarmIfTimeout)
                             {
-                                if (callbackInfos == null)
+                                if(callbackInfos == null)
                                     callbackInfos = new List<ThreadWatchdogInfo>();
 
                                 // Send a copy of the watchdog info to prevent race conditions where the watchdog
@@ -365,7 +367,7 @@ namespace OpenSim.Framework.Monitoring
                     }
                 }
 
-                if (callbackInfos != null)
+                if(callbackInfos != null)
                     foreach (ThreadWatchdogInfo callbackInfo in callbackInfos)
                         callback(callbackInfo);
             }
diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index 4dafaef288..4aad5781cd 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -753,7 +753,7 @@ namespace OpenSim.Framework
             newy *= Constants.RegionSize;
             if (oldy + oldsizey + drawdist < newy)
                 return true;
-            if (newy + newsizey + drawdist< oldy)
+            if (newy + newsizey + drawdist < oldy)
                 return true;
 
             return false;
diff --git a/OpenSim/Region/ClientStack/Linden/Caps/GetMeshModule.cs b/OpenSim/Region/ClientStack/Linden/Caps/GetMeshModule.cs
index b5a7004049..95d9c995b6 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/GetMeshModule.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/GetMeshModule.cs
@@ -88,7 +88,7 @@ namespace OpenSim.Region.ClientStack.Linden
 
         private Dictionary<UUID, string> m_capsDict = new Dictionary<UUID, string>();
         private static Thread[] m_workerThreads = null;
-
+        private static int m_NumberScenes = 0;
         private static OpenMetaverse.BlockingQueue<aPollRequest> m_queue =
                 new OpenMetaverse.BlockingQueue<aPollRequest>();
 
@@ -97,13 +97,6 @@ namespace OpenSim.Region.ClientStack.Linden
 
         #region Region Module interfaceBase Members
 
-        ~GetMeshModule()
-        {
-            foreach (Thread t in m_workerThreads)
-                Watchdog.AbortThread(t.ManagedThreadId);
-
-        }
-
         public Type ReplaceableInterface
         {
             get { return null; }
@@ -151,7 +144,7 @@ namespace OpenSim.Region.ClientStack.Linden
             m_scene.EventManager.OnRegisterCaps -= RegisterCaps;
             m_scene.EventManager.OnDeregisterCaps -= DeregisterCaps;
             m_scene.EventManager.OnThrottleUpdate -= ThrottleUpdate;
-            
+            m_NumberScenes--;
             m_scene = null;
         }
 
@@ -167,6 +160,8 @@ namespace OpenSim.Region.ClientStack.Linden
             m_scene.EventManager.OnDeregisterCaps += DeregisterCaps;
             m_scene.EventManager.OnThrottleUpdate += ThrottleUpdate;
 
+            m_NumberScenes++;
+
             if (m_workerThreads == null)
             {
                 m_workerThreads = new Thread[2];
@@ -174,7 +169,7 @@ namespace OpenSim.Region.ClientStack.Linden
                 for (uint i = 0; i < 2; i++)
                 {
                     m_workerThreads[i] = WorkManager.StartThread(DoMeshRequests,
-                            String.Format("MeshWorkerThread{0}", i),
+                            String.Format("GetMeshWorker{0}", i),
                             ThreadPriority.Normal,
                             false,
                             false,
@@ -182,22 +177,29 @@ namespace OpenSim.Region.ClientStack.Linden
                             int.MaxValue);
                 }
             }
-
         }
 
-
-        public void Close() { }
+        public void Close()
+        {
+            if(m_NumberScenes <= 0 && m_workerThreads != null)
+            {
+                m_log.DebugFormat("[GetMeshModule] Closing");
+                foreach (Thread t in m_workerThreads)
+                    Watchdog.AbortThread(t.ManagedThreadId);
+                m_queue.Clear();
+            }
+        }
 
         public string Name { get { return "GetMeshModule"; } }
 
         #endregion
 
-        private void DoMeshRequests()
+        private static void DoMeshRequests()
         {
-            while (true)
+            while(true)
             {
                 aPollRequest poolreq = m_queue.Dequeue();
-
+                Watchdog.UpdateThread();
                 poolreq.thepoll.Process(poolreq);
             }
         }
@@ -293,6 +295,9 @@ namespace OpenSim.Region.ClientStack.Linden
 
                 UUID requestID = requestinfo.reqID;
 
+                if(m_scene.ShuttingDown)
+                    return;
+
                 // If the avatar is gone, don't bother to get the texture
                 if (m_scene.GetScenePresence(Id) == null)
                 {
@@ -386,7 +391,7 @@ namespace OpenSim.Region.ClientStack.Linden
             private volatile int BytesSent = 0;
             private int Lod3 = 0;
             private int Lod2 = 0;
-            private int Lod1 = 0;
+//            private int Lod1 = 0;
             private int UserSetThrottle = 0;
             private int UDPSetThrottle = 0;
             private int CapSetThrottle = 0;
@@ -404,7 +409,6 @@ namespace OpenSim.Region.ClientStack.Linden
                 User = puser;
             }
 
-
             public bool hasEvents(UUID key, Dictionary<UUID, aPollResponse> responses)
             {
                 const float ThirtyPercent = 0.30f;
@@ -486,7 +490,6 @@ namespace OpenSim.Region.ClientStack.Linden
                 PassTime();
             }
 
-
             private void PassTime()
             {
                 currenttime = Util.EnvironmentTickCount();
@@ -501,10 +504,11 @@ namespace OpenSim.Region.ClientStack.Linden
                     {
                         Lod3 = 0;
                         Lod2 = 0;
-                        Lod1 = 0;
+//                        Lod1 = 0;
                     }
                 }
             }
+
             private void AlterThrottle(int setting, ScenePresence p)
             {
                 p.ControllingClient.SetAgentThrottleSilent((int)Throttle,setting);
@@ -534,6 +538,5 @@ namespace OpenSim.Region.ClientStack.Linden
 
             }
         }
-
     }
 }
diff --git a/OpenSim/Region/ClientStack/Linden/Caps/GetTextureModule.cs b/OpenSim/Region/ClientStack/Linden/Caps/GetTextureModule.cs
index aa51a0073f..0c4e227e21 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/GetTextureModule.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/GetTextureModule.cs
@@ -76,14 +76,13 @@ namespace OpenSim.Region.ClientStack.Linden
 
         private Dictionary<UUID, string> m_capsDict = new Dictionary<UUID, string>();
         private static Thread[] m_workerThreads = null;
-
-        private string m_Url = "localhost";
-
+        private static int m_NumberScenes = 0;
         private static OpenMetaverse.BlockingQueue<aPollRequest> m_queue =
                 new OpenMetaverse.BlockingQueue<aPollRequest>();
 
         private Dictionary<UUID,PollServiceTextureEventArgs> m_pollservices = new Dictionary<UUID,PollServiceTextureEventArgs>();
    
+        private string m_Url = "localhost";
 
         #region ISharedRegionModule Members
 
@@ -116,6 +115,7 @@ namespace OpenSim.Region.ClientStack.Linden
             m_scene.EventManager.OnRegisterCaps -= RegisterCaps;
             m_scene.EventManager.OnDeregisterCaps -= DeregisterCaps;
             m_scene.EventManager.OnThrottleUpdate -= ThrottleUpdate;
+            m_NumberScenes--;
             m_scene = null;
         }
 
@@ -128,6 +128,8 @@ namespace OpenSim.Region.ClientStack.Linden
             m_scene.EventManager.OnDeregisterCaps += DeregisterCaps;
             m_scene.EventManager.OnThrottleUpdate += ThrottleUpdate;
 
+            m_NumberScenes++;
+
             if (m_workerThreads == null)
             {
                 m_workerThreads = new Thread[2];
@@ -135,7 +137,7 @@ namespace OpenSim.Region.ClientStack.Linden
                 for (uint i = 0; i < 2; i++)
                 {
                     m_workerThreads[i] = WorkManager.StartThread(DoTextureRequests,
-                            String.Format("TextureWorkerThread{0}", i),
+                            String.Format("GetTextureWorker{0}", i),
                             ThreadPriority.Normal,
                             false,
                             false,
@@ -165,17 +167,6 @@ namespace OpenSim.Region.ClientStack.Linden
                 adjData = pthrottles;
             }
 
-            // 0.125f converts from bits to bytes
-            //int resend = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); 
-            //pos += 4;
-           // int land = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); 
-            //pos += 4;
-           // int wind = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); 
-           // pos += 4;
-           // int cloud = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); 
-           // pos += 4;
-           // int task = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); 
-           // pos += 4;
             pos = pos + 20;
             int texture = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f); //pos += 4;
             //int asset = (int)(BitConverter.ToSingle(adjData, pos) * 0.125f);
@@ -199,7 +190,18 @@ namespace OpenSim.Region.ClientStack.Linden
         {
         }
 
-        public void Close() { }
+        public void Close()
+        {
+            if(m_NumberScenes <= 0 && m_workerThreads != null)
+            {
+                m_log.DebugFormat("[GetTextureModule] Closing");
+                
+                foreach (Thread t in m_workerThreads)
+                    Watchdog.AbortThread(t.ManagedThreadId);
+            
+                m_queue.Clear();
+            }
+        }
 
         public string Name { get { return "GetTextureModule"; } }
 
@@ -210,13 +212,6 @@ namespace OpenSim.Region.ClientStack.Linden
 
         #endregion
 
-        ~GetTextureModule()
-        {
-            foreach (Thread t in m_workerThreads)
-                Watchdog.AbortThread(t.ManagedThreadId);
-
-        }
-
         private class PollServiceTextureEventArgs : PollServiceEventArgs
         {
             private List<Hashtable> requests =
@@ -306,11 +301,13 @@ namespace OpenSim.Region.ClientStack.Linden
 
                 UUID requestID = requestinfo.reqID;
 
+                if(m_scene.ShuttingDown)
+                    return;
+
                 if (requestinfo.send503)
                 {
                     response = new Hashtable();
 
-
                     response["int_response_code"] = 503;
                     response["str_response_string"] = "Throttled";
                     response["content_type"] = "text/plain";
@@ -412,15 +409,16 @@ namespace OpenSim.Region.ClientStack.Linden
             }
         }
 
-        private void DoTextureRequests()
+        private static void DoTextureRequests()
         {
             while (true)
             {
                 aPollRequest poolreq = m_queue.Dequeue();
-
+                Watchdog.UpdateThread();
                 poolreq.thepoll.Process(poolreq);
             }
         }
+
         internal sealed class CapsDataThrottler
         {
 
@@ -498,7 +496,5 @@ namespace OpenSim.Region.ClientStack.Linden
             }
             public int ThrottleBytes;
         }
-    }
-
-    
+    }   
 }
diff --git a/OpenSim/Region/ClientStack/Linden/Caps/WebFetchInvDescModule.cs b/OpenSim/Region/ClientStack/Linden/Caps/WebFetchInvDescModule.cs
index 61f4cd0245..83f60c74e8 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/WebFetchInvDescModule.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/WebFetchInvDescModule.cs
@@ -102,6 +102,8 @@ namespace OpenSim.Region.ClientStack.Linden
         private static DoubleQueue<aPollRequest> m_queue =
                 new DoubleQueue<aPollRequest>();
 
+        private static int m_NumberScenes = 0;
+
         #region ISharedRegionModule Members
 
         public WebFetchInvDescModule() : this(true) {}
@@ -145,17 +147,7 @@ namespace OpenSim.Region.ClientStack.Linden
             StatsManager.DeregisterStat(s_processedRequestsStat);
             StatsManager.DeregisterStat(s_queuedRequestsStat);
 
-            if (ProcessQueuedRequestsAsync)
-            {
-                if (m_workerThreads != null)
-                {
-                    foreach (Thread t in m_workerThreads)
-                        Watchdog.AbortThread(t.ManagedThreadId);
-
-                    m_workerThreads = null;
-                }
-            }
-
+            m_NumberScenes--;
             Scene = null;
         }
 
@@ -203,6 +195,8 @@ namespace OpenSim.Region.ClientStack.Linden
 
             Scene.EventManager.OnRegisterCaps += RegisterCaps;
 
+            m_NumberScenes++;
+
             int nworkers = 2; // was 2
             if (ProcessQueuedRequestsAsync && m_workerThreads == null)
             {
@@ -225,7 +219,23 @@ namespace OpenSim.Region.ClientStack.Linden
         {
         }
 
-        public void Close() { }
+        public void Close()
+        {
+            if (!m_Enabled)
+                return;
+
+            if (ProcessQueuedRequestsAsync)
+            {
+                if (m_NumberScenes <= 0 && m_workerThreads != null)
+                {
+                    m_log.DebugFormat("[WebFetchInvDescModule] Closing");
+                    foreach (Thread t in m_workerThreads)
+                        Watchdog.AbortThread(t.ManagedThreadId);
+
+                    m_workerThreads = null;
+                }
+            }
+        }
 
         public string Name { get { return "WebFetchInvDescModule"; } }
 
@@ -350,6 +360,9 @@ namespace OpenSim.Region.ClientStack.Linden
 
             public void Process(aPollRequest requestinfo)
             {
+                if(m_module == null || m_module.Scene == null || m_module.Scene.ShuttingDown)
+                    return;
+
                 UUID requestID = requestinfo.reqID;
 
                 Hashtable response = new Hashtable();
@@ -425,31 +438,26 @@ namespace OpenSim.Region.ClientStack.Linden
 //            }
 //        }
 
-        private void DoInventoryRequests()
+        private static void DoInventoryRequests()
         {
             while (true)
             {
                 Watchdog.UpdateThread();
 
-                WaitProcessQueuedInventoryRequest();
-            }
-        }
+                aPollRequest poolreq = m_queue.Dequeue();
 
-        public void WaitProcessQueuedInventoryRequest()
-        {
-            aPollRequest poolreq = m_queue.Dequeue();
-
-            if (poolreq != null && poolreq.thepoll != null)
-            {
-                try
+                if (poolreq != null && poolreq.thepoll != null)
                 {
-                    poolreq.thepoll.Process(poolreq);
-                }
-                catch (Exception e)
-                {
-                    m_log.ErrorFormat(
-                        "[INVENTORY]: Failed to process queued inventory request {0} for {1} in {2}.  Exception {3}", 
-                        poolreq.reqID, poolreq.presence != null ? poolreq.presence.Name : "unknown", Scene.Name, e);
+                    try
+                    {
+                        poolreq.thepoll.Process(poolreq);
+                    }
+                    catch (Exception e)
+                    {
+                        m_log.ErrorFormat(
+                            "[INVENTORY]: Failed to process queued inventory request {0} for {1}.  Exception {3}", 
+                            poolreq.reqID, poolreq.presence != null ? poolreq.presence.Name : "unknown", e);
+                    }
                 }
             }
         }
diff --git a/OpenSim/Region/CoreModules/Avatar/Attachments/Tests/AttachmentsModuleTests.cs b/OpenSim/Region/CoreModules/Avatar/Attachments/Tests/AttachmentsModuleTests.cs
index 3971da0f70..2ef86c9ac2 100644
--- a/OpenSim/Region/CoreModules/Avatar/Attachments/Tests/AttachmentsModuleTests.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Attachments/Tests/AttachmentsModuleTests.cs
@@ -556,6 +556,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Attachments.Tests
             // In the future, we need to be able to do this programatically more predicably.
             scene.EventManager.OnChatFromWorld += OnChatFromWorld;
 
+            m_chatEvent.Reset();
             scene.AttachmentsModule.RezSingleAttachmentFromInventory(sp, userItem.ID, (uint)AttachmentPoint.Chest);
 
             m_chatEvent.WaitOne(60000);
@@ -669,6 +670,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Attachments.Tests
             // In the future, we need to be able to do this programatically more predicably.
             scene.EventManager.OnChatFromWorld += OnChatFromWorld;
 
+            m_chatEvent.Reset();
             SceneObjectGroup rezzedSo
                 = (SceneObjectGroup)(scene.AttachmentsModule.RezSingleAttachmentFromInventory(sp, userItem.ID, (uint)AttachmentPoint.Chest));
 
diff --git a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
index fd6202a352..ee0a4f880f 100644
--- a/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs
@@ -206,7 +206,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             UUID fromID = UUID.Zero;
             UUID ownerID = UUID.Zero;
             string message = c.Message;
-            IScene scene = c.Scene;
+            Scene scene = c.Scene as Scene;
             UUID destination = c.Destination;
             Vector3 fromPos = c.Position;
             Vector3 regionPos = new Vector3(scene.RegionInfo.WorldLocX, scene.RegionInfo.WorldLocY, 0);
@@ -217,47 +217,48 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
 
             if (c.Channel == DEBUG_CHANNEL) c.Type = ChatTypeEnum.DebugChannel;
 
+            if(!m_scenes.Contains(scene))
+            {
+                m_log.WarnFormat("[CHAT]: message from unkown scene {0} ignored",
+                                     scene.RegionInfo.RegionName);
+                return;
+            }
+
             switch (sourceType) 
             {
-            case ChatSourceType.Agent:
-                if (!(scene is Scene))
-                {
-                    m_log.WarnFormat("[CHAT]: scene {0} is not a Scene object, cannot obtain scene presence for {1}",
-                                     scene.RegionInfo.RegionName, c.Sender.AgentId);
-                    return;
-                }
-                ScenePresence avatar = (scene as Scene).GetScenePresence(c.Sender.AgentId);
-                fromPos = avatar.AbsolutePosition;
-                fromName = avatar.Name;
-                fromID = c.Sender.AgentId;
-                if (avatar.GodLevel >= 200)
-                { // let gods speak to outside or things may get confusing
-                    fromNamePrefix = m_adminPrefix;
-                    checkParcelHide = false;
-                }
-                else
-                {
-                    checkParcelHide = true;
-                }
-                destination = UUID.Zero; // Avatars cant "SayTo"
-                ownerID = c.Sender.AgentId;
-                
-                hidePos = fromPos;
-                break;
-
-            case ChatSourceType.Object:
-                fromID = c.SenderUUID;
-
-                if (c.SenderObject != null && c.SenderObject is SceneObjectPart)
-                {
-                    ownerID = ((SceneObjectPart)c.SenderObject).OwnerID;
-                    if (((SceneObjectPart)c.SenderObject).ParentGroup.IsAttachment)
+                case ChatSourceType.Agent:
+                    ScenePresence avatar = (scene as Scene).GetScenePresence(c.Sender.AgentId);
+                    fromPos = avatar.AbsolutePosition;
+                    fromName = avatar.Name;
+                    fromID = c.Sender.AgentId;
+                    if (avatar.GodLevel >= 200)
+                    { // let gods speak to outside or things may get confusing
+                        fromNamePrefix = m_adminPrefix;
+                        checkParcelHide = false;
+                    }
+                    else
                     {
                         checkParcelHide = true;
-                        hidePos = ((SceneObjectPart)c.SenderObject).ParentGroup.AbsolutePosition;
                     }
-                }
-                break;
+                    destination = UUID.Zero; // Avatars cant "SayTo"
+                    ownerID = c.Sender.AgentId;
+                
+                    hidePos = fromPos;
+                    break;
+
+                case ChatSourceType.Object:
+                    fromID = c.SenderUUID;
+
+                    if (c.SenderObject != null && c.SenderObject is SceneObjectPart)
+                    {
+                        ownerID = ((SceneObjectPart)c.SenderObject).OwnerID;
+                        if (((SceneObjectPart)c.SenderObject).ParentGroup.IsAttachment)
+                        {
+                            checkParcelHide = true;
+                            hidePos = ((SceneObjectPart)c.SenderObject).ParentGroup.AbsolutePosition;
+                        }
+                    }
+                    break;
             }
 
             // TODO: iterate over message
@@ -275,7 +276,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
                 checkParcelHide = false;
                 if (c.Type < ChatTypeEnum.DebugChannel && destination == UUID.Zero)
                 {
-                    ILandObject srcland = (scene as Scene).LandChannel.GetLandObject(hidePos.X, hidePos.Y);
+                    ILandObject srcland = scene.LandChannel.GetLandObject(hidePos.X, hidePos.Y);
                     if (srcland != null && !srcland.LandData.SeeAVs)
                     {
                         sourceParcelID = srcland.LandData.GlobalID;
@@ -284,50 +285,42 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
                 }
             }
 
-            foreach (Scene s in m_scenes)
-            {
-                // This should use ForEachClient, but clients don't have a position.
-                // If camera is moved into client, then camera position can be used
-                // MT: No, it can't, as chat is heard from the avatar position, not
-                // the camera position.
+            scene.ForEachScenePresence(
+                delegate(ScenePresence presence)
+                {
+                    if (destination != UUID.Zero && presence.UUID != destination)
+                        return;
 
-                s.ForEachScenePresence(
-                    delegate(ScenePresence presence)
-                    {
-                        if (destination != UUID.Zero && presence.UUID != destination)
-                            return;
-                        ILandObject Presencecheck = s.LandChannel.GetLandObject(presence.AbsolutePosition.X, presence.AbsolutePosition.Y);
-                        if (Presencecheck != null)
+                    if(presence.IsChildAgent)
                         {
-                            // This will pass all chat from objects. Not
-                            // perfect, but it will do. For now. Better
-                            // than the prior behavior of muting all
-                            // objects on a parcel with access restrictions
-                            if (checkParcelHide)
-                            {
-                                if (sourceParcelID != Presencecheck.LandData.GlobalID && presence.GodLevel < 200)
-                                    return;
-                            }
-                            if (c.Sender == null || Presencecheck.IsEitherBannedOrRestricted(c.Sender.AgentId) != true)
-                            {
-                                if (TrySendChatMessage(presence, fromPos, regionPos, fromID,
-                                            ownerID, fromNamePrefix + fromName, c.Type,
-                                            message, sourceType, (destination != UUID.Zero)))
-                                    receiverIDs.Add(presence.UUID);
-                            }
+                            if(checkParcelHide)
+                                return;
+                            if (TrySendChatMessage(presence, fromPos, regionPos, fromID,
+                                        ownerID, fromNamePrefix + fromName, c.Type,
+                                        message, sourceType, (destination != UUID.Zero)))
+                                receiverIDs.Add(presence.UUID);
+                            return;
                         }
-                        else if(!checkParcelHide && (presence.IsChildAgent))
+
+                    ILandObject Presencecheck = scene.LandChannel.GetLandObject(presence.AbsolutePosition.X,            presence.AbsolutePosition.Y);
+                    if (Presencecheck != null)
+                    {
+                        if (checkParcelHide)
+                        {
+                            if (sourceParcelID != Presencecheck.LandData.GlobalID && presence.GodLevel < 200)
+                                return;
+                        }
+                        if (c.Sender == null || Presencecheck.IsEitherBannedOrRestricted(c.Sender.AgentId) != true)
                         {
                             if (TrySendChatMessage(presence, fromPos, regionPos, fromID,
-                                            ownerID, fromNamePrefix + fromName, c.Type,
-                                            message, sourceType, (destination != UUID.Zero)))
+                                        ownerID, fromNamePrefix + fromName, c.Type,
+                                        message, sourceType, (destination != UUID.Zero)))
                                 receiverIDs.Add(presence.UUID);
                         }
                     }
-                );
-            }
+                });
             
-            (scene as Scene).EventManager.TriggerOnChatToClients(
+            scene.EventManager.TriggerOnChatToClients(
                 fromID, receiverIDs, message, c.Type, fromPos, fromName, sourceType, ChatAudibleLevel.Fully);
         }
 
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index ed93f05b4c..9899ccdcce 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -1049,6 +1049,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             sp.HasMovedAway(!(OutSideViewRange || logout));
             
+            ulong sourceRegionHandle = sp.RegionHandle;
+
              // Now let's make it officially a child agent
             sp.MakeChildAgent(destinationHandle);
 
@@ -1066,8 +1068,8 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 // This sleep can be increased if necessary.  However, whilst it's active,
                 // an agent cannot teleport back to this region if it has teleported away.
                 Thread.Sleep(2000);
-                if (m_eqModule != null && !sp.DoNotCloseAfterTeleport)
-                    m_eqModule.DisableSimulator(sp.RegionHandle,sp.UUID);
+//                if (m_eqModule != null && !sp.DoNotCloseAfterTeleport)
+//                    m_eqModule.DisableSimulator(sourceRegionHandle,sp.UUID);
                 Thread.Sleep(500);
                 sp.Scene.CloseAgent(sp.UUID, false);
             }
@@ -1194,11 +1196,11 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             //HG hook
             AgentHasMovedAway(sp, logout);
 
+            ulong sourceRegionHandle = sp.RegionHandle;
+
             // Now let's make it officially a child agent
             sp.MakeChildAgent(destinationHandle);
 
-
-
             // Finally, let's close this previously-known-as-root agent, when the jump is outside the view zone
             // go by HG hook
             if (NeedsClosing(reg, OutSideViewRange))
@@ -1213,10 +1215,10 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 // DECREASING THE WAIT TIME HERE WILL EITHER RESULT IN A VIEWER CRASH OR
                 // IN THE AVIE BEING PLACED IN INFINITY FOR A COUPLE OF SECONDS.
 
-                Thread.Sleep(14000);
-                if (m_eqModule != null && !sp.DoNotCloseAfterTeleport)
-                    m_eqModule.DisableSimulator(sp.RegionHandle,sp.UUID);
-                Thread.Sleep(1000);
+                Thread.Sleep(15000);
+//                if (m_eqModule != null && !sp.DoNotCloseAfterTeleport)
+//                    m_eqModule.DisableSimulator(sourceRegionHandle,sp.UUID);
+//                Thread.Sleep(1000);
 
                 // OK, it got this agent. Let's close everything
                 // If we shouldn't close the agent due to some other region renewing the connection 
@@ -1802,6 +1804,10 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // Unlike a teleport, here we do not wait for the destination region to confirm the receipt.
             m_entityTransferStateMachine.UpdateInTransit(agent.UUID, AgentTransferState.CleaningUp);
 
+
+
+            agent.CloseChildAgents(false, neighbourRegion.RegionHandle, neighbourRegion.RegionSizeX, neighbourRegion.RegionSizeY);
+
             // this may need the attachments
 
             agent.HasMovedAway(true);
@@ -1811,9 +1817,6 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // FIXME: Possibly this should occur lower down after other commands to close other agents,
             // but not sure yet what the side effects would be.
             m_entityTransferStateMachine.ResetFromTransit(agent.UUID);
-
-            agent.CloseChildAgents(false, neighbourRegion.RegionHandle, neighbourRegion.RegionSizeX, neighbourRegion.RegionSizeY);
-
             // TODO: Check since what version this wasn't needed anymore. May be as old as 0.6
 /*
             // Backwards compatibility. Best effort
diff --git a/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs b/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
index 7d0c47f23f..e1764bf21d 100644
--- a/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
@@ -182,6 +182,8 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
 //            m_log.DebugFormat(
 //                "[USER MANAGEMENT MODULE]: Handling request for name binding of UUID {0} from {1}",
 //                uuid, remote_client.Name);
+            if(m_Scenes.Count <= 0)
+                return;
 
             if (m_Scenes[0].LibraryService != null && (m_Scenes[0].LibraryService.LibraryRootFolder.Owner == uuid))
             {
@@ -288,6 +290,9 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
 
         public List<UserData> GetUserData(string query, int page_size, int page_number)
         {
+             if(m_Scenes.Count <= 0)
+                return new List<UserData>();;
+
             // search the user accounts service
             List<UserAccount> accs = m_Scenes[0].UserAccountService.GetUserAccounts(m_Scenes[0].RegionInfo.ScopeID, query);
 
@@ -380,6 +385,9 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
         /// <param name='names'>The array of names if found.  If not found, then names[0] = "Unknown" and names[1] = "User"</param>
         private bool TryGetUserNamesFromServices(UUID uuid, string[] names)
         {
+            if(m_Scenes.Count <= 0)
+                return false;
+
             UserAccount account = m_Scenes[0].UserAccountService.GetUserAccount(UUID.Zero, uuid);
 
             if (account != null)
@@ -445,6 +453,9 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
 
         public UUID GetUserIdByName(string firstName, string lastName)
         {
+            if(m_Scenes.Count <= 0)
+                return UUID.Zero;
+
             // TODO: Optimize for reverse lookup if this gets used by non-console commands.
             lock (m_UserCache)
             {
@@ -555,6 +566,12 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
         #region Cache Management
         public bool GetUser(UUID uuid, out UserData userdata)
         {
+            if(m_Scenes.Count <= 0)
+            {
+                userdata = new UserData();
+                return false;
+            }
+
             lock (m_UserCache)
             {
                 if (m_UserCache.TryGetValue(uuid, out userdata))
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
index ef0eec5f53..f40541ea28 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/MapImage/MapImageServiceModule.cs
@@ -94,7 +94,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.MapImage
             if (config == null)
                 return;
 
-            int refreshminutes = Convert.ToInt32(config.GetString("RefreshTime", "60"));
+            int refreshminutes = Convert.ToInt32(config.GetString("RefreshTime"));
             if (refreshminutes < 0)
             {
                 m_log.WarnFormat("[MAP IMAGE SERVICE MODULE]: Negative refresh time given in config. Module disabled.");
diff --git a/OpenSim/Region/CoreModules/World/Archiver/ArchiverModule.cs b/OpenSim/Region/CoreModules/World/Archiver/ArchiverModule.cs
index cdc605bf64..ca94f4280b 100644
--- a/OpenSim/Region/CoreModules/World/Archiver/ArchiverModule.cs
+++ b/OpenSim/Region/CoreModules/World/Archiver/ArchiverModule.cs
@@ -112,7 +112,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
             float rotation = 0f;
             Vector3 rotationCenter = new Vector3(Scene.RegionInfo.RegionSizeX / 2f, Scene.RegionInfo.RegionSizeY / 2f, 0);
             Vector3 boundingOrigin = new Vector3(0f, 0f, 0f);
-            Vector3 boundingSize = new Vector3(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY, Constants.RegionHeight);
+            Vector3 boundingSize = new Vector3(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY, float.MaxValue);
             bool debug = false;
 
             OptionSet options = new OptionSet();
@@ -183,7 +183,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
             {
                 try
                 {
-                    boundingSize = v == null ? new Vector3(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY, Constants.RegionHeight) : Vector3.Parse(v);
+                    boundingSize = v == null ? new Vector3(Scene.RegionInfo.RegionSizeX, Scene.RegionInfo.RegionSizeY, float.MaxValue) : Vector3.Parse(v);
                 }
                 catch
                 {
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 55c4fda45f..8bdf39a6de 100755
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -174,6 +174,13 @@ namespace OpenSim.Region.Framework.Scenes
 
         public SynchronizeSceneHandler SynchronizeScene;
 
+        public bool ClampNegativeZ
+        {
+            get { return m_clampNegativeZ; }
+        }
+
+        private bool m_clampNegativeZ = false;
+
         /// <summary>
         /// Used to prevent simultaneous calls to code that adds and removes agents.
         /// </summary>
@@ -524,11 +531,11 @@ namespace OpenSim.Region.Framework.Scenes
 //        private int m_lastUpdate;
         private bool m_firstHeartbeat = true;
         
-        private UpdatePrioritizationSchemes m_priorityScheme = UpdatePrioritizationSchemes.Time;
-        private bool m_reprioritizationEnabled = true;
-        private double m_reprioritizationInterval = 5000.0;
-        private double m_rootReprioritizationDistance = 10.0;
-        private double m_childReprioritizationDistance = 20.0;
+//        private UpdatePrioritizationSchemes m_priorityScheme = UpdatePrioritizationSchemes.Time;
+//        private bool m_reprioritizationEnabled = true;
+//        private double m_reprioritizationInterval = 5000.0;
+//        private double m_rootReprioritizationDistance = 10.0;
+//        private double m_childReprioritizationDistance = 20.0;
 
 
         private Timer m_mapGenerationTimer = new Timer();
@@ -1029,6 +1036,8 @@ namespace OpenSim.Region.Framework.Scenes
                     m_clampPrimSize = true;
                 }
 
+                m_clampNegativeZ = startupConfig.GetBoolean("ClampNegativeZ", m_clampNegativeZ);
+
                 m_useTrashOnDelete = startupConfig.GetBoolean("UseTrashOnDelete",m_useTrashOnDelete);
                 m_trustBinaries = startupConfig.GetBoolean("TrustBinaries", m_trustBinaries);
                 m_allowScriptCrossings = startupConfig.GetBoolean("AllowScriptCrossing", m_allowScriptCrossings);
@@ -1472,11 +1481,14 @@ namespace OpenSim.Region.Framework.Scenes
 
             m_log.InfoFormat("[SCENE]: Closing down the single simulator: {0}", RegionInfo.RegionName);
 
-            StatsReporter.Close();
 
+            StatsReporter.Close();
             m_restartTimer.Stop();
             m_restartTimer.Close();
 
+            if (!GridService.DeregisterRegion(RegionInfo.RegionID))
+                m_log.WarnFormat("[SCENE]: Deregister from grid failed for region {0}", Name);
+
             // Kick all ROOT agents with the message, 'The simulator is going down'
             ForEachScenePresence(delegate(ScenePresence avatar)
             {
@@ -1503,13 +1515,10 @@ namespace OpenSim.Region.Framework.Scenes
             EventManager.TriggerSceneShuttingDown(this);
 
             m_log.Debug("[SCENE]: Persisting changed objects");
+            Backup(true);
 
-            Backup(false);
             m_sceneGraph.Close();
 
-            if (!GridService.DeregisterRegion(RegionInfo.RegionID))
-                m_log.WarnFormat("[SCENE]: Deregister from grid failed for region {0}", Name);
-
             base.Close();
 
             // XEngine currently listens to the EventManager.OnShutdown event to trigger script stop and persistence.
@@ -1619,6 +1628,8 @@ namespace OpenSim.Region.Framework.Scenes
             Watchdog.GetCurrentThreadInfo().AlarmIfTimeout = true;
             m_lastFrameTick = Util.EnvironmentTickCount();
             Update(-1);
+
+            Watchdog.RemoveThread();
 		}
 
         private void Maintenance()
diff --git a/OpenSim/Region/Framework/Scenes/SceneGraph.cs b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
index 930850091d..2ecb55b427 100755
--- a/OpenSim/Region/Framework/Scenes/SceneGraph.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
@@ -296,13 +296,15 @@ namespace OpenSim.Region.Framework.Scenes
                 Vector3 npos = new Vector3(sceneObject.RootPart.GroupPosition.X,
                                            sceneObject.RootPart.GroupPosition.Y,
                                            sceneObject.RootPart.GroupPosition.Z);
-                if (!(((sceneObject.RootPart.Shape.PCode == (byte)PCode.Prim) && (sceneObject.RootPart.Shape.State != 0))) && (npos.X < 0.0 || npos.Y < 0.0 || npos.Z < 0.0 ||
+                bool clampZ = m_parentScene.ClampNegativeZ;
+
+                if (!(((sceneObject.RootPart.Shape.PCode == (byte)PCode.Prim) && (sceneObject.RootPart.Shape.State != 0))) && (npos.X < 0.0 || npos.Y < 0.0 || (npos.Z < 0.0 && clampZ) ||
                     npos.X > regionSizeX ||
                     npos.Y > regionSizeY))
                 {
                     if (npos.X < 0.0) npos.X = 1.0f;
                     if (npos.Y < 0.0) npos.Y = 1.0f;
-                    if (npos.Z < 0.0) npos.Z = 0.0f;
+                    if (npos.Z < 0.0 && clampZ) npos.Z = 0.0f;
                     if (npos.X > regionSizeX) npos.X = regionSizeX - 1.0f;
                     if (npos.Y > regionSizeY) npos.Y = regionSizeY - 1.0f;
 
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 5903274064..0d2c8c35b5 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -4143,8 +4143,8 @@ namespace OpenSim.Region.Framework.Scenes
                             {
                                 byebyeRegions.Add(handle);
                                 // this should not be here
-                                if(eventQueue != null)
-                                    eventQueue.DisableSimulator(handle,UUID);
+//                                if(eventQueue != null)
+///                                    eventQueue.DisableSimulator(handle,UUID);
                             }
                         }
                         else
@@ -4154,8 +4154,8 @@ namespace OpenSim.Region.Framework.Scenes
                             {
                                 byebyeRegions.Add(handle);
                                 // this should not be here
-                                if(eventQueue != null)
-                                    eventQueue.DisableSimulator(handle,UUID);
+//                                if(eventQueue != null)
+//                                    eventQueue.DisableSimulator(handle,UUID);
                             }
                         }
                     }
diff --git a/OpenSim/Region/ScriptEngine/XEngine/Tests/XEngineCrossingTests.cs b/OpenSim/Region/ScriptEngine/XEngine/Tests/XEngineCrossingTests.cs
index 903727788b..c9772854a4 100644
--- a/OpenSim/Region/ScriptEngine/XEngine/Tests/XEngineCrossingTests.cs
+++ b/OpenSim/Region/ScriptEngine/XEngine/Tests/XEngineCrossingTests.cs
@@ -196,6 +196,7 @@ default
 
                 EventParams ep = new EventParams("touch_start", new Object[] { new LSL_Types.LSLInteger(1) }, det);
 
+                Thread.Sleep(250); // wait for other change messages to pass
                 messageReceived = null;
                 chatEventB.Reset();
                 xEngineB.PostObjectEvent(soSceneB.LocalId, ep);
diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index 09dda10409..72213537e2 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -138,6 +138,9 @@
     ; This can be overridden in the region config file.
     ClampPrimSize = false
 
+    ; If a prim is loaded from an external source, clamp it to Z = 0 if Z is negative.
+    ClampNegativeZ = false
+
     ; Maximum number of prims allowable in a linkset. Affects creating new linksets. Ignored if less than or equal to zero.
     ; This can be overridden in the region config file.
     LinksetPrims = 0