Dave, this is exactly the problem I'm talking about! A 1.8GHz machine should be able to have this program singing! Forget the problems I'm having - my PC is borderline - but there's no justification for the trouble you're having! Like I've said before, I run 4 other 3D apps (that work) on my machine with NO problems. Sure, some of the higher end options (like GI and caustics) are a bit slow, but they WORK. I really feel for people that want to use this for commercial work - for their livelihood and can't.