The only other thing I can think of that I've installed recently is the Windows XP Service Pack 1 update. I'm curious if those of you that are NOT having problems with P5 have installed SP1 for XP yet? It copuld be a Win XP SP1 issue???? Hmmmm..... I'm not so sure though because everything else on my system is working fine. Just had problem after problem with P5. Also I noticed one of you posted a reply asking if anyone encountered the render problem where loading a scene put you into a "rendering loop" - yes I had that one also. That happened with 3 out of the 4 scenes I created. Also had a problem with the materials room where after clicking back onto another room - the screan would frezze and leave behin garbage. This sounds like video to me but I already have the latest Nvidia drivers.