I get this error - and from what has been posted on the yahoo forum this is actually some kind of "General protection fault error" from Carrara. I get it simply by right-clicking in the viewport and selecting rotate, dolly or bank - it pops up immediately. (The other like zoom, move etc works OK) Use the icons on the left instead and there's no error. So it seems to me they have hardcoded something in CS3 that is not entirely consistent and that's why these "general errors" pop up. Mainly just an annoyance though, as I can click OK or cancel and continue. Originally I didn't get these errors, so maybe either a point-release 3.02, 3.03 or 3.04 or similar or add-ons. Rune