I am having the same "flickering", on/off, White/Black text problems. Using a Voodoo 5 and get it under DX 7 and 8. I tried deleting preferances and found that it make no differance to the game engine whether I am using "Primary" of "Software" 3D rendering. Thief and Everquest run fine, GREAT with my Voodoo... I think it is something about the CMBO coding at this point. Off to the Tech forum to see what new might be there.
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Olmoss