I think this is a bug. I called glColor3i( 255, 0, 0 ) and the image disappeared.

Yes, most definitely, that is the only conclusion we can draw based on the informative introduction you have given us to the problem and your accurate summary of the symptoms and your system setup.

Good one :slight_smile:

Next time at least show up some source so people can show you its not an opengl bug but its you that is the bug :slight_smile: