Thanks for your reply Michael. I am using a stock b&w g3 350 with onboard openGL in the ATI card. It may be that openGL is buggy, so I'll try the defaults and see what happens. The g3 upgrade shouldn't be causing you any grief - I recently heard windows Car was in beta for 3 months before the code freeze. The Mac version was in beta 3 DAYS before the freeze. We've got bugs a plenty - it IS beta ; ) I'll try minimal extensions and see what happens. Thanks. -Tuck