diff --git a/src/osgTerrain/GeometryTechnique.cpp b/src/osgTerrain/GeometryTechnique.cpp
index 5495a1da5..82410bb13 100644
--- a/src/osgTerrain/GeometryTechnique.cpp
+++ b/src/osgTerrain/GeometryTechnique.cpp
@@ -35,6 +35,7 @@ GeometryTechnique::GeometryTechnique():
     setFilterBias(0);
     setFilterWidth(0.1);
     setFilterMatrixAs(GAUSSIAN);
+    
 }
 
 GeometryTechnique::GeometryTechnique(const GeometryTechnique& gt,const osg::CopyOp& copyop):
@@ -526,6 +527,8 @@ void GeometryTechnique::init()
         smoother.smooth(*buffer._geometry);
     }
 
+    if (buffer._transform.valid()) buffer._transform->setThreadSafeRefUnref(true);
+
     _dirty = false;    
 
     swapBuffers();
@@ -581,7 +584,11 @@ void GeometryTechnique::traverse(osg::NodeVisitor& nv)
     }
 
 
-    if (_dirty) init();
+    if (_dirty) 
+    {
+        osg::notify(osg::NOTICE)<<"******* Doing init ***********"<<std::endl;
+        init();
+    }
 
     BufferData& buffer = getReadOnlyBuffer();
     if (buffer._transform.valid()) buffer._transform->accept(nv);
diff --git a/src/osgTerrain/TerrainNode.cpp b/src/osgTerrain/TerrainNode.cpp
index 11f7d62ee..40f72acf6 100644
--- a/src/osgTerrain/TerrainNode.cpp
+++ b/src/osgTerrain/TerrainNode.cpp
@@ -21,6 +21,7 @@ TerrainNode::TerrainNode():
     _treatBoundariesToValidDataAsDefaultValue(false)
 {
     setNumChildrenRequiringUpdateTraversal(1);
+    setThreadSafeRefUnref(true);
 }
 
 TerrainNode::TerrainNode(const TerrainNode& terrain,const osg::CopyOp& copyop):
diff --git a/src/osgTerrain/TerrainTechnique.cpp b/src/osgTerrain/TerrainTechnique.cpp
index ee90614b9..6fae30433 100644
--- a/src/osgTerrain/TerrainTechnique.cpp
+++ b/src/osgTerrain/TerrainTechnique.cpp
@@ -20,6 +20,7 @@ TerrainTechnique::TerrainTechnique():
     _terrainNode(0),
     _dirty(true)
 {
+    setThreadSafeRefUnref(true);
 }
 
 TerrainTechnique::TerrainTechnique(const TerrainTechnique& TerrainTechnique,const osg::CopyOp& copyop):