I have coded a little postprocessor based on OpenGL. One of the possible display is by using Material Coloring. While it was working fine under a Geforce3 Ti500 in debug and optimized mode, I only obtain the gray material on the Geforce4 4600 that was recently installed in my PC. The Material Coloring does not seem to work anylonger. I checked for any OpenGL error without much luck. It is probably a bug in my code but can't seem to find where it is. Has somebody experienced similar problem? Thanks for any feedback. Eric My working system: Dual Athlon, GeForce4 4600 2GB ram, Windows XP, Microsoft Visual C++6 sp5, Nvidia 29.80 (have also tried 29.42) [edited by - elm on July 23, 2002 2:14:09 PM]