diff --git a/src/BasicPathFinding.cs b/src/BasicPathFinding.cs
index 6bc7690..186aef6 100644
--- a/src/BasicPathFinding.cs
+++ b/src/BasicPathFinding.cs
@@ -145,57 +145,57 @@ namespace OpenSim.Modules.PathFinding
 
         private void generatePathEnvironment(ScriptRequestData requestData)
         {
-            try
+            lock(m_environments)
             {
-                UUID _envID = UUID.Random();
-                Environment _newEnv = new Environment(_envID.ToString(), (int)m_scene.RegionInfo.RegionSizeX);
-
-                lock (m_environments)
+                try
                 {
-                    m_environments.Add(_newEnv);
-                }
+                    UUID _envID = UUID.Random();
+                    Environment _newEnv = new Environment(_envID.ToString(), (int)m_scene.RegionInfo.RegionSizeX);
 
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19850, _envID.ToString(), requestData.RequestID.ToString());
-            }
-            catch(Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                    m_environments.Add(_newEnv);
+
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19850, _envID.ToString(), requestData.RequestID.ToString());
+                }
+                catch (Exception _error)
+                {
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                }
             }
         }
 
         private void keepAlivePathEnv(ScriptRequestData requestData)
         {
-            try
+            lock (m_environments)
             {
-                Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
-
-                if (_env != null)
+                try
                 {
-                    lock(_env)
+                    Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
+
+                    if (_env != null)
                     {
                         _env.LastTimeUsed = (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
                         m_scriptModule.DispatchReply(requestData.ScriptID, 19850, "", requestData.RequestID.ToString());
                         return;
                     }
-                }
 
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
-            }
-            catch (Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
+                }
+                catch (Exception _error)
+                {
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                }
             }
         }
         
         private void removeAllTargets(ScriptRequestData requestData)
         {
-            try
+            lock(m_environments)
             {
-                Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
-
-                if (_env != null)
+                try
                 {
-                    lock(_env)
+                    Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
+
+                    if (_env != null)
                     {
                         List<PathNode> _nodes = _env.Nodes.FindAll(X => X.Target == true);
 
@@ -205,22 +205,22 @@ namespace OpenSim.Modules.PathFinding
                         }
                     }
                 }
-            }
-            catch (Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                catch (Exception _error)
+                {
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                }
             }
         }
 
         private void setPositionData(ScriptRequestData requestData, Vector3 position, int walkable, int isTarget)
         {
-            try
+            lock(m_environments)
             {
-                Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
-
-                if (_env != null)
+                try
                 {
-                    lock(_env)
+                    Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
+
+                    if (_env != null)
                     {
                         if (isTarget == 1)
                             removeAllTargets(requestData);
@@ -247,25 +247,25 @@ namespace OpenSim.Modules.PathFinding
 
                         return;
                     }
-                }
 
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
-            }
-            catch (Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
+                }
+                catch (Exception _error)
+                {
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                }
             }
         }
 
         private void setLineData(ScriptRequestData requestData, Vector3 start, Vector3 target, int walkable)
         {
-            try
+            lock(m_environments)
             {
-                Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
-
-                if (_env != null)
+                try
                 {
-                    lock(_env)
+                    Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
+
+                    if (_env != null)
                     {
                         if ((int)start.X == (int)target.X || (int)start.Y == (int)target.Y)
                         {
@@ -328,16 +328,16 @@ namespace OpenSim.Modules.PathFinding
                             m_scriptModule.DispatchReply(requestData.ScriptID, 19853, "", requestData.RequestID.ToString());
                         }
                     }
+                    else
+                    {
+                        m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
+                    }
                 }
-                else
+                catch (Exception _error)
                 {
-                    m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
                 }
             }
-            catch (Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
-            }
         }
 
         private void generatePath(ScriptRequestData requestData)
@@ -347,13 +347,13 @@ namespace OpenSim.Modules.PathFinding
 
         private void generateDebugImage(ScriptRequestData requestData)
         {
-            try
+            lock(m_environments)
             {
-                Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
-
-                if (_env != null)
+                try
                 {
-                    lock (_env)
+                    Environment _env = m_environments.Find(X => X.ID == requestData.EnvironmentID);
+
+                    if (_env != null)
                     {
                         Bitmap _bitmap = new Bitmap(_env.Size, _env.Size);
 
@@ -370,16 +370,16 @@ namespace OpenSim.Modules.PathFinding
                         }
 
                         _bitmap.Save(requestData.EnvironmentID + ".png");
-                        m_scriptModule.DispatchReply(requestData.ScriptID, 19850, "", requestData.RequestID.ToString());
+                        m_scriptModule.DispatchReply(requestData.ScriptID, 19850, requestData.EnvironmentID + ".png", requestData.RequestID.ToString());
                         return;
                     }
-                }
 
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
-            }
-            catch (Exception _error)
-            {
-                m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19851, "", requestData.RequestID.ToString());
+                }
+                catch (Exception _error)
+                {
+                    m_scriptModule.DispatchReply(requestData.ScriptID, 19860, _error.Message, requestData.RequestID.ToString());
+                }
             }
         }