The only app you've mentioned that would possibly use the OpenGL hardware besides AC3D would be gmax (the others use non-accelerated display modes).
Can you check whether you're using Direct3D/OpenGL/other acceleration in gmax? If you're not already using OpenGL in gmax, can you try switching it and see if that works?
If OpenGL initializes in gmax but not in AC3D, perhaps someone knows of some opengl hardware tests you could try out, or perhaps Andy & folks have a switch or two you could try?
Good luck,
Dennis
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