The original version of P6 had memory problems. Since they released SR1, I haven't had any problems at all. It's been rock-solid for me, much more so than PP or P5 ever were. For example, I can do other things while rendering. I was afraid to do that with earlier versions of Poser, because half the time they'd crash. Performance was lousy anyway, because Poser was sucking up all the system resources. Now I can let P6 render a long animation while I surf the Web or answer my e-mail, and everything works great.