I run Carrara with 9.1 on a G4-450DP and it is very stable, heck the first release was even stable for me. I have 640MB real ram and I give carrara about 175 megs I believe. I am on my laptop so I can't tell. You may want to look at your system extensions too, you may have a conflict. If all else fails I would recommend a clean install of the system software and or format the HD and do a complete reinstall of everything. You can also try deleting some of your prefrence files. I would delete System, Finder, and the Carrara prefs, which are located in the Carrara folder. Also rebuild your desktop and zap your PRAM. Carrara should not crash very often, I have had it installed since it was first released early last year and have experienced only 2 crashes. They were related to my system and not Carrara. Now on my PC, well that is another story! Hope it helps, PAGZone