Still waiting for P5 at the moment but... Had a problem under P4 a few days ago rendering a single tree from the Virtual Forest pack.. Win98/ NVIDIA GeForce2 MX 400 / 350 meg mem / AMD Duron 850... okay I have a slower processor ;) I downloaded the latest Nvidia drivers as someone suggested and the problem was fixed - perfect render. I'd had this in the past with imported 3ds and obj files but never on a purchased prop so I put it down previously to bad modelling work. Someone else in the chat room said they had experienced the same problem with the same graphics card under P4. I can only presume under P5 is going to be the same if you don't have up to date drivers. Can't wait for my new system to turn up all the same:)