I've had the "crash when I try to render" problem, and that was different. After restarting, I could open the file just fine in P6. Random textures were missing, but it opened fine.

I think this problem is related to cloth sims. When I open the file, I get a "out of memory" error message - every time. Even after a reboot. And entire props and figures are invisible. They're still in the file, judging from the hierarchy editor and the file size, but don't display.