I run Carrara 1.1 on a 400mgz Pismo with 512 ram (250 allocated to C), OS 9.1 and No Virtual memory. I don't have any problems with crashes at all. Do use the software renser for your scenes, it's better than OpenGL. I believe that once upon a time there was a problem/conflict with the "Color Picker" extension but don't know exactly waht it was.