diff --git a/OpenSim/Framework/Communications/Cache/AssetCache.cs b/OpenSim/Framework/Communications/Cache/AssetCache.cs
index 7d06a1e502..bd0b1b1d6e 100644
--- a/OpenSim/Framework/Communications/Cache/AssetCache.cs
+++ b/OpenSim/Framework/Communications/Cache/AssetCache.cs
@@ -350,7 +350,7 @@ namespace OpenSim.Framework.Communications.Cache
                     // If it's a direct request for a script, drop it
                     // because it's a hacked client
                     if (req.AssetRequestSource != 2 || assetInf.Type != 10)
-                        AssetRequests.Add(req);
+                        lock(AssetRequests) AssetRequests.Add(req);
                 }
             }
 
@@ -487,7 +487,7 @@ namespace OpenSim.Framework.Communications.Cache
             req.Params = transferRequest.TransferInfo.Params;
             req.AssetInf = new AssetInfo(asset);
             req.NumPackets = CalculateNumPackets(asset.Data);
-            AssetRequests.Add(req);
+            lock(AssetRequests) AssetRequests.Add(req);
         }
 
         /// <summary>
@@ -506,16 +506,16 @@ namespace OpenSim.Framework.Communications.Cache
             int num = Math.Min(5, AssetRequests.Count);
 
             AssetRequest req;
-            AssetRequestToClient req2 = null;
+            AssetRequestToClient req2 = new AssetRequestToClient();
+
             for (int i = 0; i < num; i++)
             {
-                req = AssetRequests[i];
-                if (req2 == null)
+                lock(AssetRequests)
                 {
-                    req2 = new AssetRequestToClient();
+                   req = AssetRequests[0];
+                   AssetRequests.RemoveAt(0);
                 }
-                
-                // Trying to limit memory usage by only creating AssetRequestToClient if needed               
+
                 req2.AssetInf = req.AssetInf;
                 req2.AssetRequestSource = req.AssetRequestSource;
                 req2.DataPointer = req.DataPointer;
@@ -528,13 +528,9 @@ namespace OpenSim.Framework.Communications.Cache
                 req2.RequestAssetID = req.RequestAssetID;
                 req2.TransferRequestID = req.TransferRequestID;
                 req.RequestUser.SendAsset(req2);
+
             }
 
-            //remove requests that have been completed
-            for (int i = 0; i < num; i++)
-            {
-                AssetRequests.RemoveAt(0);
-            }
         }
 
         public class AssetRequest
diff --git a/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs b/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
index b4ec7ae496..dedd37fb60 100644
--- a/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
+++ b/OpenSim/Region/CoreModules/Scripting/DynamicTexture/DynamicTextureModule.cs
@@ -66,15 +66,37 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
         /// <param name="data"></param>
         public void ReturnData(UUID id, byte[] data)
         {
-            if (Updaters.ContainsKey(id))
+
+			DynamicTextureUpdater updater = null;
+
+            lock(Updaters)
+            {
+				if (Updaters.ContainsKey(id))
+				{
+					updater = Updaters[id];
+                }
+            }
+
+            if(updater != null)
             {
-                DynamicTextureUpdater updater = Updaters[id];
                 if (RegisteredScenes.ContainsKey(updater.SimUUID))
                 {
                     Scene scene = RegisteredScenes[updater.SimUUID];
                     updater.DataReceived(data, scene);
                 }
             }
+
+			if(updater.UpdateTimer == 0)
+			{
+				lock(Updaters)
+				{
+					if (!Updaters.ContainsKey(updater.UpdaterID))
+					{
+						Updaters.Remove(updater.UpdaterID);
+					}
+				}
+			}
+
         }
 
         public UUID AddDynamicTextureURL(UUID simID, UUID primID, string contentType, string url,
@@ -101,9 +123,12 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
                 updater.BlendWithOldTexture = SetBlending;
                 updater.FrontAlpha = AlphaValue;
 
-                if (!Updaters.ContainsKey(updater.UpdaterID))
+                lock(Updaters)
                 {
-                    Updaters.Add(updater.UpdaterID, updater);
+					if (!Updaters.ContainsKey(updater.UpdaterID))
+					{
+						Updaters.Add(updater.UpdaterID, updater);
+					}
                 }
 
                 RenderPlugins[contentType].AsyncConvertUrl(updater.UpdaterID, url, extraParams);
@@ -134,9 +159,12 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
                 updater.BlendWithOldTexture = SetBlending;
                 updater.FrontAlpha = AlphaValue;
 
-                if (!Updaters.ContainsKey(updater.UpdaterID))
+                lock(Updaters)
                 {
-                    Updaters.Add(updater.UpdaterID, updater);
+					if (!Updaters.ContainsKey(updater.UpdaterID))
+					{
+						Updaters.Add(updater.UpdaterID, updater);
+					}
                 }
 
                 RenderPlugins[contentType].AsyncConvertData(updater.UpdaterID, data, extraParams);
@@ -270,7 +298,6 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
 
                 // remove the old asset from the cache
                 UUID oldID = tmptex.DefaultTexture.TextureID;
-                scene.CommsManager.AssetCache.ExpireAsset(oldID);
 
                 tmptex.DefaultTexture.TextureID = asset.FullID;
                 // I'm pretty sure we always want to force this to true
@@ -278,6 +305,9 @@ namespace OpenSim.Region.CoreModules.Scripting.DynamicTexture
 
                 part.Shape.Textures = tmptex;
                 part.ScheduleFullUpdate();
+
+                scene.CommsManager.AssetCache.ExpireAsset(oldID);
+
             }
 
             private byte[] BlendTextures(byte[] frontImage, byte[] backImage, bool setNewAlpha, byte newAlpha)