diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index 6f429905d1..da30a04ab9 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -3824,6 +3824,49 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 m_entityUpdates.Enqueue(priority, new EntityUpdate(entity, updateFlags, m_scene.TimeDilation));
         }
 
+
+        /// <summary>
+        /// Requeue an EntityUpdate when it was not acknowledged by the client. 
+        /// We will update the priority and put it in the correct queue, merging update flags 
+        /// with any other updates that may be queued for the same entity. 
+        /// The original update time is used for the merged update.
+        /// </summary>
+        private void ResendPrimUpdate(EntityUpdate update)
+        {
+            // If the update exists in priority queue, it will be updated.
+            // If it does not exist then it will be added with the current (rather than its original) priority
+            uint priority = m_prioritizer.GetUpdatePriority(this, update.Entity);
+
+            lock (m_entityUpdates.SyncRoot)
+                m_entityUpdates.Enqueue(priority, update);
+        }
+
+        /// <summary>
+        /// Requeue a list of EntityUpdates when they were not acknowledged by the client. 
+        /// We will update the priority and put it in the correct queue, merging update flags 
+        /// with any other updates that may be queued for the same entity. 
+        /// The original update time is used for the merged update.
+        /// </summary>
+        private void ResendPrimUpdates(List<EntityUpdate> updates, OutgoingPacket oPacket)
+        {
+            // m_log.WarnFormat("[CLIENT] resending prim updates {0}, packet sequence number {1}", updates[0].UpdateTime, oPacket.SequenceNumber);
+
+            // Remove the update packet from the list of packets waiting for acknowledgement
+            // because we are requeuing the list of updates. They will be resent in new packets
+            // with the most recent state and priority.
+            m_udpClient.NeedAcks.Remove(oPacket.SequenceNumber);
+
+            // Count this as a resent packet since we are going to requeue all of the updates contained in it
+            Interlocked.Increment(ref m_udpClient.PacketsResent);
+
+            // We're not going to worry about interlock yet since its not currently critical that this total count
+            // is 100% correct
+            m_udpServer.PacketsResentCount++;
+
+            foreach (EntityUpdate update in updates)
+                ResendPrimUpdate(update);
+        }
+ 
         private void ProcessEntityUpdates(int maxUpdates)
         {
             OpenSim.Framework.Lazy<List<ObjectUpdatePacket.ObjectDataBlock>> objectUpdateBlocks = new OpenSim.Framework.Lazy<List<ObjectUpdatePacket.ObjectDataBlock>>();
@@ -4044,7 +4087,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 for (int i = 0; i < blocks.Count; i++)
                     packet.ObjectData[i] = blocks[i];
 
-                OutPacket(packet, ThrottleOutPacketType.Unknown, true);
+                OutPacket(packet, ThrottleOutPacketType.Unknown, true, delegate(OutgoingPacket oPacket) { ResendPrimUpdates(terseUpdates.Value, oPacket); });
             }
 
             if (objectUpdateBlocks.IsValueCreated)
@@ -4090,8 +4133,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
     
                 for (int i = 0; i < blocks.Count; i++)
                     packet.ObjectData[i] = blocks[i];
-   
-                OutPacket(packet, ThrottleOutPacketType.Task, true);
+
+                OutPacket(packet, ThrottleOutPacketType.Task, true, delegate(OutgoingPacket oPacket) { ResendPrimUpdates(terseUpdates.Value, oPacket); });
             }
 
             #endregion Packet Sending
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
index 99e7aba1d0..f66534df0e 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
@@ -1245,7 +1245,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             int dataLength = buffer.DataLength;
 
             // NOTE: I'm seeing problems with some viewers when ACKs are appended to zerocoded packets so I've disabled that here
-            if (!isZerocoded && !isResend)
+            if (!isZerocoded && !isResend && outgoingPacket.UnackedMethod == null)
             {
                 // Keep appending ACKs until there is no room left in the buffer or there are
                 // no more ACKs to append