diff --git a/OpenSim/Region/ClientStack/LindenUDP/LLImageManager.cs b/OpenSim/Region/ClientStack/LindenUDP/LLImageManager.cs
index 2120d33d42..cc290edd99 100644
--- a/OpenSim/Region/ClientStack/LindenUDP/LLImageManager.cs
+++ b/OpenSim/Region/ClientStack/LindenUDP/LLImageManager.cs
@@ -88,7 +88,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 J2KImage imgrequest;
 
                 // Do a linear search for this texture download
-                lock (m_priorityQueue)
+                lock (m_syncRoot)
                     m_priorityQueue.Find(delegate(J2KImage img) { return img.TextureID == newRequest.RequestedAssetID; }, out imgrequest);
 
                 if (imgrequest != null)
@@ -99,7 +99,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
                         try 
                         {
-                            lock (m_priorityQueue)
+                            lock (m_syncRoot)
                                 m_priorityQueue.Delete(imgrequest.PriorityQueueHandle); 
                         }
                         catch (Exception) { }
@@ -211,7 +211,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         {
             J2KImage image = null;
 
-            lock (m_priorityQueue)
+            lock (m_syncRoot)
             {
 
                 if (m_priorityQueue.Count > 0)
@@ -230,23 +230,27 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         {
             image.PriorityQueueHandle = null;
 
-            lock (m_priorityQueue)
-                m_priorityQueue.Add(ref image.PriorityQueueHandle, image);
+            lock (m_syncRoot)
+                try
+                {
+                    m_priorityQueue.Add(ref image.PriorityQueueHandle, image);
+                }
+                catch (Exception) { }
         }
 
         void RemoveImageFromQueue(J2KImage image)
         {
-            try
-            {
-                lock (m_priorityQueue)
+            lock (m_syncRoot)
+                try
+                {
                     m_priorityQueue.Delete(image.PriorityQueueHandle);
-            }
-            catch (Exception) { }
+                }
+                catch (Exception) { }
         }
 
         void UpdateImageInQueue(J2KImage image)
         {
-            lock (m_priorityQueue)
+            lock (m_syncRoot)
             {
                 try { m_priorityQueue.Replace(image.PriorityQueueHandle, image); }
                 catch (Exception)