diff --git a/src/osgViewer/CompositeViewer.cpp b/src/osgViewer/CompositeViewer.cpp
index 9d21a09c7..ebede960d 100644
--- a/src/osgViewer/CompositeViewer.cpp
+++ b/src/osgViewer/CompositeViewer.cpp
@@ -639,14 +639,15 @@ void CompositeViewer::realize()
     }
 
 
-    startThreading();
-
     // initialize the global timer to be relative to the current time.
     osg::Timer::instance()->setStartTick();
 
     // pass on the start tick to all the associated eventqueues
     setStartTick(osg::Timer::instance()->getStartTick());
 
+    // configure threading.
+    setUpThreading();
+
     if (osg::DisplaySettings::instance()->getCompileContextsHint())
     {
         int numProcessors = OpenThreads::GetNumberOfProcessors();
diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index ab4adb867..bd9b84787 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -587,6 +587,7 @@ void Viewer::realize()
     // pass on the start tick to all the associated event queues
     setStartTick(osg::Timer::instance()->getStartTick());
 
+    // configure threading.
     setUpThreading();
 
     if (osg::DisplaySettings::instance()->getCompileContextsHint())
diff --git a/src/osgViewer/ViewerBase.cpp b/src/osgViewer/ViewerBase.cpp
index 425ee82dd..ea70af49b 100644
--- a/src/osgViewer/ViewerBase.cpp
+++ b/src/osgViewer/ViewerBase.cpp
@@ -177,6 +177,17 @@ void ViewerBase::setUpThreading()
 
                 Scenes scenes;
                 getScenes(scenes);
+
+                for(Scenes::iterator scitr = scenes.begin();
+                    scitr != scenes.end();
+                    ++scitr)
+                {
+                    if ((*scitr)->getSceneData())
+                    {
+                        // update the scene graph so that it has enough GL object buffer memory for the graphics contexts that will be using it.
+                        (*scitr)->getSceneData()->resizeGLObjectBuffers(osg::DisplaySettings::instance()->getMaxNumberOfGraphicsContexts());
+                    }
+                }
             }
         }
     }