I never did install SR-3, but do have the other updates. Using the "reset lights" python script by agiel in freestuff before changing lights, eliminated about 80% of my hangs. The rest seem to be related to textures. As already stated, some of the better hair (Neftis for one) uses large texture files. You can reduce the size of them as some have done, or simply use the Poser 4 renderer. The other thing that seems to drive P5 a bit whacko is .bum files. Be prepared for "slowness" and "confusion" when you use them. Also, if you render to a new window, avoid trying to cancel....that will sometimes freeze your computer. I try to get what I want by testing in the "same window". You can cancel there without any problems. I leave rendering to a new window for the very end.....when I'm just about ready to do a final product. Finally......save very frequently :)