I have an ATI card using the Rage Pro chip as well. Take a look at the known issues for the newest driver (5-28-99) release date. Janes WWII fighters has an issue with snowy, white graphics as well. You are having a driver problem, either wait for a new version, or get a different (i.e. older) driver. Judging from the list of problems with that driver, it is TERRIBLE to put it mildly. The version I have installed on my card doesn't have white graphics, but it does perform terribly, because it tries to render the prop. My solution, buy a viper 770.

I ABSOLUTELY can't stand this card.
FYI: My card is an 8mb Expert@work, but they use the exact same drivers. Here's the link to the page in question for the version you have:
http://support.ati.com/drivers/3drage_pro.html bloom25
THUNDERBIRDS