I'm sort of an old newbie having started as Ray Dream 5 was leaving the scene. I'm going through the "unknown error when saving render" problem again. For a while with C3 I thought it was gone for good. I don't have potent equipment -- a laptop with a 700 mega hz P IV with 320 megs of ram and a 500 mega hz PIII with 380 megs of ram. Problem is on both machines with most files. Occasionally I'll get a save, but it takes days to get lucky. I've tried shutting down and restarting, reloading the software, and reloading the operating systems -- Me on the laptop and 98 on the desktop. What else can I try? Thanks for your insights. Paul