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The screenshots that look like a pool of used motor oil reflecting in the sun are caused by a conflict between UT and the MicroConversion's Game Wizard Voodoo2 drivers.  Since MicroConversion went kaput long ago, a fix to the drivers is not likely to be forthcoming.

 If you have a machine other than an iMac, the easiest way to overcome this problem is to install the Voodoo 2 reference drivers from 3dfx and ditch the ones from MicroConversions.

If you own an iMac, the 3dfx drivers aren't going to help you as they don't recognize the mezzanine slot your card is sitting in.  The only way to take a decent screenshot with an iMac Game Wizard installed is to download Glide Hack, a freeware utility, and configure it to take your screenshots for you.