Sorry, PilotHigh, I missed the part about your having 2 gigs of RAM (there have been a few Poser Mac users on the forum who have gotten all flustered when their new machines with only 512mb of RAM won't run Poser well -- you're obviously not one of them). PilotHigh, try going into your Poser 7 Preferences and under the Render tab checking Render as Separate Process, and move the slider to 3 Threads (assuming your iMac has two processes with two cores each). I've discovered that this greatly improves stability. Pushing the slider to 4 is asking for trouble as the machine then seems to have no breathing room for anything esle you have running. 2 GB should be plenty for you to avoid your problems -- in addition to my Macbook Pro with 2 GB(for when I travel) and my Mac Pro (for my office), I have almost exactly the same configuration as you (including 2GB of RAM) have in a 24" iMac at home, and simply don't have those problems. The iMac doesn't run P7 as fast as my Mac Pro (which also has a souped up video card and 4 gigs of RAM), but it's still faster than my MacBook, and in any case neither have any of the problems you cited. I do multi-character animation -- big, fat scenes with lots of morphed-up figures and textures, rendered at relatively high resolutions -- and, at least in that way, push my machines to their limit. Thought it can get slow at HD-type resolutions, it almost never crashes (although "undoing" certain actions in the Keyframes Editor several times risks a rare freeze, though never a crash).