diff -ru OpenCSG-1.2.0/include/opencsg.h OpenCSG-1.2.0-reset/include/opencsg.h
--- OpenCSG-1.2.0/include/opencsg.h	2010-01-02 21:04:10.000000000 +0100
+++ OpenCSG-1.2.0-reset/include/opencsg.h	2010-01-03 00:41:30.000000000 +0100
@@ -229,6 +229,9 @@
                 Algorithm, 
                 DepthComplexityAlgorithm = NoDepthComplexitySampling);
 
+    // call this function whenever switching the OpenGL context
+    void reset();
+
 } // namespace OpenCSG
 
 #endif // __OpenCSG__opencsg_h__
Only in OpenCSG-1.2.0-reset/include: opencsg.h~
diff -ru OpenCSG-1.2.0/src/channelManager.h OpenCSG-1.2.0-reset/src/channelManager.h
--- OpenCSG-1.2.0/src/channelManager.h	2010-01-02 21:03:01.000000000 +0100
+++ OpenCSG-1.2.0-reset/src/channelManager.h	2010-01-03 00:40:53.000000000 +0100
@@ -79,9 +79,9 @@
         /// moved into alpha, to allow alpha testing of the channel.
         static void setupTexEnv(Channel channel);
 
-    private:
-
         static OpenGL::OffscreenBuffer* gOffscreenBuffer;
+
+    private:
         static int gOffscreenType;
         static bool gInUse;
 
Only in OpenCSG-1.2.0-reset/src: channelManager.h~
diff -ru OpenCSG-1.2.0/src/offscreenBuffer.cpp OpenCSG-1.2.0-reset/src/offscreenBuffer.cpp
--- OpenCSG-1.2.0/src/offscreenBuffer.cpp	2010-01-02 21:03:04.000000000 +0100
+++ OpenCSG-1.2.0-reset/src/offscreenBuffer.cpp	2010-01-03 00:41:28.000000000 +0100
@@ -24,9 +24,22 @@
 #include "frameBufferObjectExt.h"
 #include "pBufferTexture.h"
 #include <GL/glew.h>
+#include "channelManager.h"
+
+static bool reset_fARB = false;
+static bool reset_fEXT = false;
+static bool reset_p = false;
 
 namespace OpenCSG {
 
+    void reset()
+    {
+	reset_fARB = true;
+	reset_fEXT = true;
+	reset_p = true;
+	OpenCSG::ChannelManager::gOffscreenBuffer = NULL;
+    }
+
     namespace OpenGL {
 
         OffscreenBuffer* getOffscreenBuffer(bool fbo) {
@@ -36,19 +49,28 @@
             
             if (fbo) {
                 if (GLEW_ARB_framebuffer_object) {
-                    if (!fARB)
+                    if (reset_fARB || !fARB) {
+                        delete fARB;
                         fARB = new FrameBufferObject;
+                        reset_fARB = false;
+                    }
                     return fARB;
                 }
                 else {
-                    if (!fEXT)
+                    if (reset_fEXT || !fEXT) {
+                        delete fEXT;
                         fEXT = new FrameBufferObjectExt;
+                        reset_fEXT = false;
+                    }
                     return fEXT;
                 }
             }
             else {
-                if (!p)
+                if (reset_p || !p) {
+                    delete p;
                     p = new PBufferTexture;
+                    reset_p = false;
+                }
                 return p;
             }
         }
Only in OpenCSG-1.2.0-reset/src: offscreenBuffer.cpp~