diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 4e87014e17..8b7605519b 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -1568,6 +1568,10 @@ namespace OpenSim.Region.Framework.Scenes
         #endregion
 
         private float? m_boundsRadius = null;
+        public void InvalidBoundsRadius()
+        {
+            m_boundsRadius = null;
+        }
 
         public float GetBoundsRadius()
         {
@@ -2346,6 +2350,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             // a copy isnt backedup
             dupe.Backup = false;
+            dupe.InvalidBoundsRadius();
   
             // a copy is not in transit hopefully
             dupe.inTransit = false;
@@ -3175,6 +3180,8 @@ namespace OpenSim.Region.Framework.Scenes
             // unmoved prims!
             ResetChildPrimPhysicsPositions();
 
+            InvalidBoundsRadius();
+
             if (m_rootPart.PhysActor != null)
                 m_rootPart.PhysActor.Building = false;
 
@@ -3326,6 +3333,8 @@ namespace OpenSim.Region.Framework.Scenes
 
             objectGroup.HasGroupChangedDueToDelink = true;
 
+            InvalidBoundsRadius();
+
             if (sendEvents)
                 linkPart.TriggerScriptChangedEvent(Changed.LINK);
 
@@ -3832,6 +3841,7 @@ namespace OpenSim.Region.Framework.Scenes
                 if (pa != null)
                     m_scene.PhysicsScene.AddPhysicsActorTaint(pa);
             }
+            InvalidBoundsRadius();
         }
 
         #endregion
@@ -3962,11 +3972,13 @@ namespace OpenSim.Region.Framework.Scenes
                     obPart.Scale = newSize;
                     obPart.UpdateOffSet(currentpos);
                 }
-
-                HasGroupChanged = true;
-                m_rootPart.TriggerScriptChangedEvent(Changed.SCALE);
-                ScheduleGroupForFullUpdate();
             }
+
+            InvalidBoundsRadius();
+            HasGroupChanged = true;
+            m_rootPart.TriggerScriptChangedEvent(Changed.SCALE);
+            ScheduleGroupForFullUpdate();
+
         }
 
         #endregion
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index 445a6db6bb..3d6a4c8918 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -867,6 +867,8 @@ namespace OpenSim.Region.Framework.Scenes
 
                 if (ParentGroup != null && !ParentGroup.IsDeleted)
                 {
+                    ParentGroup.InvalidBoundsRadius();
+
                     PhysicsActor actor = PhysActor;
                     if (ParentID != 0 && actor != null)
                     {
@@ -1165,7 +1167,8 @@ namespace OpenSim.Region.Framework.Scenes
                 {
 
                     m_shape.Scale = value;
-
+                    if (ParentGroup != null)
+                        ParentGroup.InvalidBoundsRadius();
                     PhysicsActor actor = PhysActor;
                     if (actor != null)
                     {