diff --git a/OpenSim/Region/Environment/Scenes/InnerScene.cs b/OpenSim/Region/Environment/Scenes/InnerScene.cs
index 03f3cd0255..0ca3405dba 100644
--- a/OpenSim/Region/Environment/Scenes/InnerScene.cs
+++ b/OpenSim/Region/Environment/Scenes/InnerScene.cs
@@ -129,7 +129,7 @@ namespace OpenSim.Region.Environment.Scenes
 
         internal void UpdateEntities()
         {
-            List<EntityBase> updateEntities = new List<EntityBase>(Entities.Values);
+            List<EntityBase> updateEntities = GetEntities();
 
             foreach (EntityBase entity in updateEntities)
             {
@@ -147,7 +147,7 @@ namespace OpenSim.Region.Environment.Scenes
 
         internal void UpdateEntityMovement()
         {
-            List<EntityBase> moveEntities = new List<EntityBase>(Entities.Values);
+            List<EntityBase> moveEntities = GetEntities();
 
             foreach (EntityBase entity in moveEntities)
             {
@@ -174,7 +174,10 @@ namespace OpenSim.Region.Environment.Scenes
             if (!Entities.ContainsKey(sceneObject.UUID))
             {
                 //  QuadTree.AddObject(sceneObject);
-                Entities.Add(sceneObject.UUID, sceneObject);
+                lock (Entities)
+                {
+                    Entities.Add(sceneObject.UUID, sceneObject);
+                }
                 m_numPrim++;
             }
         }
@@ -188,7 +191,9 @@ namespace OpenSim.Region.Environment.Scenes
         }
         public void RemovePrim(uint localID, LLUUID avatar_deleter)
         {
-            foreach (EntityBase obj in Entities.Values)
+            List<EntityBase> EntityList = GetEntities();
+
+            foreach (EntityBase obj in EntityList)
             {
                 if (obj is SceneObjectGroup)
                 {
@@ -310,7 +315,12 @@ namespace OpenSim.Region.Environment.Scenes
         /// <returns></returns>
         public List<ScenePresence> GetScenePresences()
         {
-            List<ScenePresence> result = new List<ScenePresence>(ScenePresences.Values);
+            List<ScenePresence> result;
+
+            lock (ScenePresences)
+            {
+                result = new List<ScenePresence>(ScenePresences.Values);
+            }
 
             return result;
         }
@@ -330,8 +340,9 @@ namespace OpenSim.Region.Environment.Scenes
         public List<ScenePresence> GetScenePresences(FilterAvatarList filter)
         {
             List<ScenePresence> result = new List<ScenePresence>();
+            List<ScenePresence> ScenePresencesList = GetScenePresences();
 
-            foreach (ScenePresence avatar in ScenePresences.Values)
+            foreach (ScenePresence avatar in ScenePresencesList)
             {
                 if (filter(avatar))
                 {
@@ -358,7 +369,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         private SceneObjectGroup GetGroupByPrim(uint localID)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntityList = GetEntities();
+
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -371,7 +384,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         private SceneObjectGroup GetGroupByPrim(LLUUID fullID)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntityList = GetEntities();
+
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -461,6 +476,18 @@ namespace OpenSim.Region.Environment.Scenes
             return false;
         }
 
+        public List<EntityBase> GetEntities()
+        {
+            List<EntityBase> result;
+
+            lock (Entities)
+            {
+                result = new List<EntityBase>(Entities.Values);
+            }
+
+            return result;
+        }
+
         #endregion
 
         #region Other Methods
@@ -484,7 +511,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void SendAllSceneObjectsToClient(ScenePresence presence)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntityList = GetEntities();
+
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -770,8 +799,10 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="childPrims"></param>
         public void LinkObjects(uint parentPrim, List<uint> childPrims)
         {
+            List<EntityBase> EntityList = GetEntities();
+
             SceneObjectGroup parenPrim = null;
-            foreach (EntityBase ent in Entities.Values)
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -788,7 +819,7 @@ namespace OpenSim.Region.Environment.Scenes
             {
                 for (int i = 0; i < childPrims.Count; i++)
                 {
-                    foreach (EntityBase ent in Entities.Values)
+                    foreach (EntityBase ent in EntityList)
                     {
                         if (ent is SceneObjectGroup)
                         {
@@ -819,8 +850,10 @@ namespace OpenSim.Region.Environment.Scenes
             // XXX I'm anticipating that building this dictionary once is more efficient than
             // repeated scanning of the Entity.Values for a large number of primIds.  However, it might
             // be more efficient yet to keep this dictionary permanently on hand.
+
             Dictionary<uint, SceneObjectGroup> sceneObjects = new Dictionary<uint, SceneObjectGroup>();
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -863,8 +896,10 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="flags"></param>
         public void DuplicateObject(uint originalPrim, LLVector3 offset, uint flags, LLUUID AgentID, LLUUID GroupID)
         {
+            List<EntityBase> EntityList = GetEntities();
+
             SceneObjectGroup originPrim = null;
-            foreach (EntityBase ent in Entities.Values)
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -882,7 +917,10 @@ namespace OpenSim.Region.Environment.Scenes
                 {
                     SceneObjectGroup copy = originPrim.Copy(AgentID, GroupID);
                     copy.AbsolutePosition = copy.AbsolutePosition + offset;
-                    Entities.Add(copy.UUID, copy);
+                    lock (Entities)
+                    {
+                        Entities.Add(copy.UUID, copy);
+                    }
                     m_numPrim++;
                     copy.ScheduleGroupForFullUpdate();
                 }
diff --git a/OpenSim/Region/Environment/Scenes/Scene.Inventory.cs b/OpenSim/Region/Environment/Scenes/Scene.Inventory.cs
index 7026fea95d..9821906f4a 100644
--- a/OpenSim/Region/Environment/Scenes/Scene.Inventory.cs
+++ b/OpenSim/Region/Environment/Scenes/Scene.Inventory.cs
@@ -33,6 +33,7 @@ using OpenSim.Framework;
 using OpenSim.Framework.Communications.Cache;
 using OpenSim.Framework.Console;
 using OpenSim.Region.Physics.Manager;
+using System.Collections.Generic;
 
 namespace OpenSim.Region.Environment.Scenes
 {
@@ -342,7 +343,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         private SceneObjectGroup GetGroupByPrim(uint localID)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -455,7 +458,10 @@ namespace OpenSim.Region.Environment.Scenes
                 {
                     EntityBase selectedEnt = null;
                     //MainLog.Instance.Verbose("CLIENT", "LocalID:" + Data.ObjectLocalID.ToString());
-                    foreach (EntityBase ent in Entities.Values)
+
+                    List<EntityBase> EntitieList = GetEntities();
+
+                    foreach (EntityBase ent in EntitieList)
                     {
                         if (ent.LocalId == Data.ObjectLocalID)
                         {
diff --git a/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs b/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
index aa7c7b41eb..6a7c266a3d 100644
--- a/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
+++ b/OpenSim/Region/Environment/Scenes/Scene.PacketHandlers.cs
@@ -97,7 +97,9 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="remoteClient"></param>
         public void SelectPrim(uint primLocalID, IClientAPI remoteClient)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -119,7 +121,9 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="remoteClient"></param>
         public void DeselectPrim(uint primLocalID, IClientAPI remoteClient)
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -137,7 +141,9 @@ namespace OpenSim.Region.Environment.Scenes
         {
             EventManager.TriggerObjectGrab(localID, offsetPos, remoteClient);
 
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
diff --git a/OpenSim/Region/Environment/Scenes/Scene.cs b/OpenSim/Region/Environment/Scenes/Scene.cs
index 8277f396df..db2e4b8563 100644
--- a/OpenSim/Region/Environment/Scenes/Scene.cs
+++ b/OpenSim/Region/Environment/Scenes/Scene.cs
@@ -1615,7 +1615,9 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="message"></param>
         public void SendGeneralAlert(string message)
         {
-            foreach (ScenePresence presence in m_scenePresences.Values)
+            List<ScenePresence> presenceList = GetScenePresences();
+
+            foreach (ScenePresence presence in presenceList)
             {
                 presence.ControllingClient.SendAlertMessage(message);
             }
@@ -1776,7 +1778,9 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="modal"></param>
         public void SendAlertToUser(string firstName, string lastName, string message, bool modal)
         {
-            foreach (ScenePresence presence in m_scenePresences.Values)
+            List<ScenePresence> presenceList = GetScenePresences();
+
+            foreach (ScenePresence presence in presenceList)
             {
                 if ((presence.Firstname == firstName) && (presence.Lastname == lastName))
                 {
@@ -1821,7 +1825,9 @@ namespace OpenSim.Region.Environment.Scenes
         /// </summary>
         public void ForceClientUpdate()
         {
-            foreach (EntityBase ent in Entities.Values)
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -1838,7 +1844,10 @@ namespace OpenSim.Region.Environment.Scenes
         public void HandleEditCommand(string[] cmdparams)
         {
             Console.WriteLine("Searching for Primitive: '" + cmdparams[0] + "'");
-            foreach (EntityBase ent in Entities.Values)
+
+            List<EntityBase> EntitieList = GetEntities();
+
+            foreach (EntityBase ent in EntitieList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -2017,7 +2026,8 @@ namespace OpenSim.Region.Environment.Scenes
             if (!(m_scenePresences.Equals(null)))
             {
                 try {
-                    foreach (ScenePresence presence in m_scenePresences.Values)
+		            List<ScenePresence> presenceList = GetScenePresences();
+                    foreach (ScenePresence presence in presenceList)
                     {
                         action(presence);
                     }
@@ -2033,7 +2043,14 @@ namespace OpenSim.Region.Environment.Scenes
         /// <param name="action"></param>
         public void ForEachObject(Action<SceneObjectGroup> action)
         {
-            foreach (SceneObjectGroup presence in m_sceneObjects.Values)
+            List<SceneObjectGroup> presenceList;
+
+            lock (m_sceneObjects)
+            {
+                presenceList = new List<SceneObjectGroup>(m_sceneObjects.Values);
+            }
+
+            foreach (SceneObjectGroup presence in presenceList)
             {
                 action(presence);
             }
@@ -2074,6 +2091,11 @@ namespace OpenSim.Region.Environment.Scenes
             m_innerScene.ForEachClient(action);
         }
 
+        public List<EntityBase> GetEntities()
+        {
+            return m_innerScene.GetEntities();
+        }
+
         #endregion
     }
 }
diff --git a/OpenSim/Region/Environment/Scenes/SceneManager.cs b/OpenSim/Region/Environment/Scenes/SceneManager.cs
index c589e8db21..e822874804 100644
--- a/OpenSim/Region/Environment/Scenes/SceneManager.cs
+++ b/OpenSim/Region/Environment/Scenes/SceneManager.cs
@@ -290,7 +290,9 @@ namespace OpenSim.Region.Environment.Scenes
         {
             ForEachCurrentScene(delegate(Scene scene)
                                     {
-                                        foreach (EntityBase entity in scene.Entities.Values)
+                                        List<EntityBase> EntitieList = scene.GetEntities();
+
+                                        foreach (EntityBase entity in EntitieList)
                                         {
                                             if (entity is ScenePresence)
                                             {
@@ -315,7 +317,9 @@ namespace OpenSim.Region.Environment.Scenes
 
             ForEachCurrentScene(delegate(Scene scene)
                                     {
-                                        foreach (EntityBase entity in scene.Entities.Values)
+                                        List<EntityBase> EntitieList = scene.GetEntities();
+
+                                        foreach (EntityBase entity in EntitieList)
                                         {
                                             if (entity is ScenePresence)
                                             {
@@ -419,4 +423,4 @@ namespace OpenSim.Region.Environment.Scenes
             m_localScenes.ForEach(action);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Region/Environment/Scenes/SceneXmlLoader.cs b/OpenSim/Region/Environment/Scenes/SceneXmlLoader.cs
index c4411e3a8d..aeb9c6133a 100644
--- a/OpenSim/Region/Environment/Scenes/SceneXmlLoader.cs
+++ b/OpenSim/Region/Environment/Scenes/SceneXmlLoader.cs
@@ -108,7 +108,10 @@ namespace OpenSim.Region.Environment.Scenes
             StreamWriter stream = new StreamWriter(file);
             int primCount = 0;
             stream.WriteLine("<scene>\n");
-            foreach (EntityBase ent in m_innerScene.Entities.Values)
+
+            List<EntityBase> EntityList = m_innerScene.GetEntities();
+
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {
@@ -170,7 +173,10 @@ namespace OpenSim.Region.Environment.Scenes
             StreamWriter stream = new StreamWriter(file);
             int primCount = 0;
             stream.WriteLine("<scene>\n");
-            foreach (EntityBase ent in m_innerScene.Entities.Values)
+
+            List<EntityBase> EntityList = m_innerScene.GetEntities();
+
+            foreach (EntityBase ent in EntityList)
             {
                 if (ent is SceneObjectGroup)
                 {