diff --git a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
index 58de44ea75..01df5750da 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.Inventory.cs
@@ -2310,7 +2310,24 @@ namespace OpenSim.Region.Framework.Scenes
             m_sceneGraph.DelinkObjects(parts);
         }
 
+        /// <summary>
+        /// Link the scene objects containing the indicated parts to a root object.
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="parentPrimId">A root prim id of the object which will be the root prim of the resulting linkset.</param>
+        /// <param name="childPrimIds">A list of child prims for the objects that should be linked in.</param>
         public void LinkObjects(IClientAPI client, uint parentPrimId, List<uint> childPrimIds)
+        {
+            LinkObjects(client.AgentId, parentPrimId, childPrimIds);
+        }
+
+        /// <summary>
+        /// Link the scene objects containing the indicated parts to a root object.
+        /// </summary>
+        /// <param name="agentId">The ID of the user linking.</param>
+        /// <param name="parentPrimId">A root prim id of the object which will be the root prim of the resulting linkset.</param>
+        /// <param name="childPrimIds">A list of child prims for the objects that should be linked in.</param>
+        public void LinkObjects(UUID agentId, uint parentPrimId, List<uint> childPrimIds)
         {
             List<UUID> owners = new List<UUID>();
 
@@ -2323,7 +2340,7 @@ namespace OpenSim.Region.Framework.Scenes
                 return;
             }
 
-            if (!Permissions.CanLinkObject(client.AgentId, root.ParentGroup.RootPart.UUID))
+            if (!Permissions.CanLinkObject(agentId, root.ParentGroup.RootPart.UUID))
             {
                 m_log.DebugFormat("[LINK]: Refusing link. No permissions on root prim");
                 return;
@@ -2339,7 +2356,7 @@ namespace OpenSim.Region.Framework.Scenes
                 if (!owners.Contains(part.OwnerID))
                     owners.Add(part.OwnerID);
 
-                if (Permissions.CanLinkObject(client.AgentId, part.ParentGroup.RootPart.UUID))
+                if (Permissions.CanLinkObject(agentId, part.ParentGroup.RootPart.UUID))
                     children.Add(part);
             }
 
diff --git a/OpenSim/Region/Framework/Scenes/SceneGraph.cs b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
index 17563bd537..6dd42ddd28 100644
--- a/OpenSim/Region/Framework/Scenes/SceneGraph.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
@@ -1751,6 +1751,10 @@ namespace OpenSim.Region.Framework.Scenes
                 {
                     SceneObjectGroup child = children[i].ParentGroup;
 
+                    // Don't try and add a group to itself - this will only cause severe problems later on.
+                    if (child == parentGroup)
+                        continue;
+
                     // Make sure no child prim is set for sale
                     // So that, on delink, no prims are unwittingly
                     // left for sale and sold off
@@ -1777,8 +1781,13 @@ namespace OpenSim.Region.Framework.Scenes
 
                 // We need to explicitly resend the newly link prim's object properties since no other actions
                 // occur on link to invoke this elsewhere (such as object selection)
-                parentGroup.RootPart.CreateSelected = true;
-                parentGroup.TriggerScriptChangedEvent(Changed.LINK);
+                if (childGroups.Count > 0)
+                {
+                    parentGroup.RootPart.CreateSelected = true;
+                    parentGroup.TriggerScriptChangedEvent(Changed.LINK);
+                    parentGroup.HasGroupChanged = true;
+                    parentGroup.ScheduleGroupForFullUpdate();
+                }
             }
             finally
             {
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 46c4d7b2ea..683aafcf56 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -2361,6 +2361,10 @@ namespace OpenSim.Region.Framework.Scenes
 //                "[SCENE OBJECT GROUP]: Linking group with root part {0}, {1} to group with root part {2}, {3}",
 //                objectGroup.RootPart.Name, objectGroup.RootPart.UUID, RootPart.Name, RootPart.UUID);
 
+            // Linking to ourselves is not a valid operation.
+            if (objectGroup == this)
+                return;
+
             SceneObjectPart linkPart = objectGroup.m_rootPart;
 
             Vector3 oldGroupPosition = linkPart.GroupPosition;
diff --git a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
index a2332bb4ec..be5b4a8986 100644
--- a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
+++ b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
@@ -39,14 +39,31 @@ using log4net;
 
 namespace OpenSim.Region.Framework.Scenes.Tests
 {
-    /// <summary>
-    /// Linking tests
-    /// </summary>
     [TestFixture]
     public class SceneObjectLinkingTests
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
+        /// <summary>
+        /// Links to self should be ignored.
+        /// </summary>
+        [Test]
+        public void TestLinkToSelf()
+        {
+            TestHelpers.InMethod();
+
+            UUID ownerId = TestHelpers.ParseTail(0x1);
+            int nParts = 3;
+
+            TestScene scene = SceneHelpers.SetupScene();
+            SceneObjectGroup sog1 = SceneHelpers.CreateSceneObject(nParts, ownerId, "TestLinkToSelf_", 0x10);
+            scene.AddSceneObject(sog1);
+            scene.LinkObjects(ownerId, sog1.LocalId, new List<uint>() { sog1.Parts[1].LocalId });
+//            sog1.LinkToGroup(sog1);
+
+            Assert.That(sog1.Parts.Length, Is.EqualTo(nParts));
+        }
+
         [Test]
         public void TestLinkDelink2SceneObjects()
         {
diff --git a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
index 3ea7352159..a0ae55aa3f 100644
--- a/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
+++ b/OpenSim/Region/OptionalModules/World/NPC/NPCModule.cs
@@ -299,13 +299,16 @@ namespace OpenSim.Region.OptionalModules.World.NPC
                 NPCAvatar av;
                 if (m_avatars.TryGetValue(agentID, out av))
                 {
+//                    m_log.DebugFormat("[NPC MODULE]: Found {0} {1} to remove", agentID, av.Name);
                     scene.RemoveClient(agentID, false);
                     m_avatars.Remove(agentID);
 
+//                    m_log.DebugFormat("[NPC MODULE]: Removed {0} {1}", agentID, av.Name);
                     return true;
                 }
             }
 
+//            m_log.DebugFormat("[NPC MODULE]: Could not find {0} to remove", agentID);
             return false;
         }
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
index 34f2cc7aaa..da2ef7b2b1 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
@@ -538,6 +538,9 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
 
         public bool Stop(int timeout)
         {
+//            m_log.DebugFormat(
+//                "[SCRIPT INSTANCE]: Stopping script {0} {1} with timeout {2}", ScriptName, ItemID, timeout);
+
             IScriptWorkItem result;
 
             lock (m_EventQueue)
@@ -772,7 +775,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
                         }
                         catch (Exception e)
                         {
-                            // m_log.DebugFormat("[SCRIPT] Exception: {0}", e.Message);
+//                            m_log.DebugFormat(
+//                                "[SCRIPT] Exception in script {0} {1}: {2}{3}",
+//                                ScriptName, ItemID, e.Message, e.StackTrace);
+
                             m_InEvent = false;
                             m_CurrentEvent = String.Empty;
 
diff --git a/OpenSim/Region/UserStatistics/WebStatsModule.cs b/OpenSim/Region/UserStatistics/WebStatsModule.cs
index 24a94180db..f627e37d8f 100644
--- a/OpenSim/Region/UserStatistics/WebStatsModule.cs
+++ b/OpenSim/Region/UserStatistics/WebStatsModule.cs
@@ -301,7 +301,7 @@ namespace OpenSim.Region.UserStatistics
 
         public void OnRegisterCaps(UUID agentID, Caps caps)
         {
-            m_log.DebugFormat("[VC]: OnRegisterCaps: agentID {0} caps {1}", agentID, caps);
+            m_log.DebugFormat("[WEB STATS MODULE]: OnRegisterCaps: agentID {0} caps {1}", agentID, caps);
             string capsPath = "/CAPS/VS/" + UUID.Random();
             caps.RegisterHandler("ViewerStats",
                                  new RestStreamHandler("POST", capsPath,
@@ -462,7 +462,7 @@ namespace OpenSim.Region.UserStatistics
                 
                     if (!m_sessions.ContainsKey(agentID))
                     {
-                        m_log.Warn("[VS]: no session for stat disclosure");
+                        m_log.Warn("[WEB STATS MODULE]: no session for stat disclosure");
                         return new UserSessionID();
                     }
                     uid = m_sessions[agentID];
@@ -667,14 +667,13 @@ namespace OpenSim.Region.UserStatistics
                     {
                         updatecmd.ExecuteNonQuery();
                     }
-                    catch 
-                        (SqliteExecutionException)
+                    catch (SqliteExecutionException)
                     {
-                        m_log.Warn("[WEBSTATS]: failed to write stats to storage Execution Exception");
+                        m_log.Warn("[WEB STATS MODULE]: failed to write stats to storage Execution Exception");
                     }
                     catch (SqliteSyntaxException)
                     {
-                        m_log.Warn("[WEBSTATS]: failed to write stats to storage SQL Syntax Exception");
+                        m_log.Warn("[WEB STATS MODULE]: failed to write stats to storage SQL Syntax Exception");
                     }
 
                 }
diff --git a/prebuild.xml b/prebuild.xml
index 7f069bd11a..0454e246e6 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -3320,6 +3320,7 @@
       <Reference name="OpenSim.Framework.Servers.HttpServer"/>
       <Reference name="OpenSim.Region.CoreModules"/>
       <Reference name="OpenSim.Region.Framework"/>
+      <Reference name="OpenSim.Region.ScriptEngine.Shared"/>
       <Reference name="OpenSim.Region.ScriptEngine.XEngine"/>
       <Reference name="OpenSim.Tests.Common"/>
       <Files>