What Mino said. The Voodoo III won't handle 32 bit color and yet it acts like it can in the selector. You're going to want to delete your video.cfg file from your settings directory and restart AH. The video options menu will show, select 16 bit color and you should be fine.
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Doug "Pyro" Balmos
HiTech Creations
"If it's stupid but works, it's not stupid."