Could be related to interrupt sharing as well.
For instance, if your video card is sharing the interrupt with the USB port, joystick motion could cause screen flashing.
Or if you video card is sharing an interrupt with the gameport card, the same thing is liable to happen with a gameport setup.
But with any GF card, always set the Mipmapping lvel to "High quality", as it does default to "Best image", which causes other issues. They default to that so the cards will run better in benchmarks.
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Roy "Skuzzy" Neese
President, AppLink Corp.
http://www.applink.netskuzzy@applink.net