diff -r 89e065397ea6 -r e24348a560a6 src/opengl/qpaintengine_opengl.cpp
--- a/src/opengl/qpaintengine_opengl.cpp	Thu May 27 13:40:48 2010 +0300
+++ b/src/opengl/qpaintengine_opengl.cpp	Fri Jun 11 14:24:45 2010 +0300
@@ -1453,6 +1453,11 @@
     d->device->endPaint();
     qt_mask_texture_cache()->maintainCache();
 
+#if defined(Q_WS_X11)
+    // clear out the references we hold for textures bound with the
+    // texture_from_pixmap extension
+    ctx->d_func()->boundPixmaps.clear();
+#endif
     return true;
 }