diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index aab6a49d1b..96eeec442d 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -631,6 +631,14 @@ namespace OpenSim.Region.Framework.Scenes
                     if (triggerScriptEvent)
                         part.TriggerScriptChangedEvent(Changed.POSITION);
                 }
+
+/*
+    This seems not needed and should not be needed:
+    sp absolute position depends on sit part absolute position fixed above.
+    sp ParentPosition is not used anywhere.
+    Since presence is sitting, viewer considers it 'linked' to root prim, so it will move/rotate it
+    Sending a extra packet with avatar position is not only bandwidth waste, but may cause jitter in viewers due to UPD nature.
+ 
                 if (!m_dupeInProgress)
                 {
                     foreach (ScenePresence av in m_linkedAvatars)
@@ -640,12 +648,12 @@ namespace OpenSim.Region.Framework.Scenes
                         {
                             Vector3 offset = p.GetWorldPosition() - av.ParentPosition;
                             av.AbsolutePosition += offset;
-                            av.ParentPosition = p.GetWorldPosition(); //ParentPosition gets cleared by AbsolutePosition
+//                            av.ParentPosition = p.GetWorldPosition(); //ParentPosition gets cleared by AbsolutePosition
                             av.SendAvatarDataToAllAgents();
                         }
                     }
                 }
-
+*/
                 //if (m_rootPart.PhysActor != null)
                 //{
                 //m_rootPart.PhysActor.Position =
@@ -676,8 +684,8 @@ namespace OpenSim.Region.Framework.Scenes
                 if (agent.ParentUUID != UUID.Zero)
                 {
                     agent.ParentPart = null;
-                    agent.ParentPosition = Vector3.Zero;
-                    //                    agent.ParentUUID = UUID.Zero;
+//                    agent.ParentPosition = Vector3.Zero;
+//                    agent.ParentUUID = UUID.Zero;
                 }
             }
 
@@ -3752,7 +3760,7 @@ namespace OpenSim.Region.Framework.Scenes
                         else
                         // ugly rotation update of all parts
                         {
-                            group.AbsolutePosition = AbsolutePosition;
+                            group.ResetChildPrimPhysicsPositions();
                         }
 
                     }
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 87b4d9fdfd..a068aab52e 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -433,7 +433,7 @@ namespace OpenSim.Region.Framework.Scenes
             get { return (IClientCore)ControllingClient; }
         }
 
-        public Vector3 ParentPosition { get; set; }
+//        public Vector3 ParentPosition { get; set; }
 
         /// <summary>
         /// Position of this avatar relative to the region the avatar is in
@@ -491,7 +491,7 @@ namespace OpenSim.Region.Framework.Scenes
                 if (ParentID == 0)
                 {
                     m_pos = value;
-                    ParentPosition = Vector3.Zero;
+//                    ParentPosition = Vector3.Zero;
                 }
 
                 //m_log.DebugFormat(
@@ -857,11 +857,12 @@ namespace OpenSim.Region.Framework.Scenes
                     part.ParentGroup.AddAvatar(UUID);
                     if (part.SitTargetPosition != Vector3.Zero)
                         part.SitTargetAvatar = UUID;
-                    ParentPosition = part.GetWorldPosition();
+//                    ParentPosition = part.GetWorldPosition();
                     ParentID = part.LocalId;
                     ParentPart = part;
                     m_pos = m_prevSitOffset;
-                    pos = ParentPosition;
+//                    pos = ParentPosition;
+                    pos = part.GetWorldPosition();
                 }
                 ParentUUID = UUID.Zero;
 
@@ -1933,11 +1934,12 @@ namespace OpenSim.Region.Framework.Scenes
                     part.SitTargetAvatar = UUID.Zero;
 
                 part.ParentGroup.DeleteAvatar(UUID);
-                ParentPosition = part.GetWorldPosition();
+//                ParentPosition = part.GetWorldPosition();
                 ControllingClient.SendClearFollowCamProperties(part.ParentUUID);
 
-                m_pos += ParentPosition + new Vector3(0.0f, 0.0f, 2.0f * m_sitAvatarHeight);
-                ParentPosition = Vector3.Zero;
+//                m_pos += ParentPosition + new Vector3(0.0f, 0.0f, 2.0f * m_sitAvatarHeight);
+//                ParentPosition = Vector3.Zero;
+                m_pos += part.GetWorldPosition() + new Vector3(0.0f, 0.0f, 2.0f * m_sitAvatarHeight);
 
                 ParentID = 0;
                 ParentPart = null;
@@ -2388,13 +2390,13 @@ namespace OpenSim.Region.Framework.Scenes
 
 //                    m_pos = sitTargetPos + SIT_TARGET_ADJUSTMENT - sitOffset;
                     Rotation = sitTargetOrient;
-                    ParentPosition = part.AbsolutePosition;
+//                    ParentPosition = part.AbsolutePosition;
                     part.ParentGroup.AddAvatar(UUID);
                 }
                 else
                 {
                     m_pos -= part.AbsolutePosition;
-                    ParentPosition = part.AbsolutePosition;
+//                    ParentPosition = part.AbsolutePosition;
                     part.ParentGroup.AddAvatar(UUID);
 
 //                        m_log.DebugFormat(