I don't hav any useful advice. I have seen P6 cholke on simple images and chole on complex images. It seems some props (like hair props) are sometimes poorly behaved and cause P6 to crash. You're likely to have better luck rendering in P5. Have you installed SR1 for P6 yet? That might help (or it might cause other problems ;-) I am confident that some day soon P6 will be useable. I'm sure P6 will be fixed before P7 is released. I had similar problems in the first two or three versions of P5.