This is a pretty weird and VERY aggravating problem. C5Pro appears to be the most stable version I've ever had my hands on. I'm running on a laptop with an ATI card as well but it's a very vanilla card. Just a post to present some compassion on the issue. Previous versions have had their moments. The original metacreations version of C was the real master of madness for bugs (even after you applied the elusive and mysterious patch)! I got very lucky to secure a copy of the metacreations version before it vanished into the ether and then it was tough to find the patch on the net after Metacreations disappeared (thank you EOVIA!). I would definitely update your video drivers with ATI's latest stuff and also update Windows (if you haven't already). I'd also try to remember any other software you may or may not have been running since your last reboot. Just a shot in the dark but maybe something to think about if you're trying to track memory leaks (who knows). -Kix

-Kix