I found this on the Official GTU Site. That they released a new version.
It has been released @ 25-01-2002.
Click on Read More... to the fixes and for direct download link.

Known issues for current latest beta:
You can't browse through the expert mode with the keyboard
Changes since 3.1.2:
Fixed GTU not showing the Z-Occlusion-Culling box with >23.xx drivers
Click Here for direct download