I just installed the Windows patch... still can't render a scene that was built in C1.1. I made no changes to the scene what so ever... it's the original C1 car file. The scene would render fine in C1.1. The program just locks up.. never even starts to render. Can't abort the render or anything. I have to use the task manager to kill C2. I sent an email about it but never got a response. My system is an 800 Athlon, 768Mb, Win XP Pro. Actually now that I think of it, I haven't got much of anything to work in C2 that was built in C1.1 I really wish I had put the money I spent on C2 towards upgrading Cimena. Ed