I'm staying clear of any cross-fire... but just one thought occurs. I haven't got Poser 6 yet, but Poser 5 was notoriously unable to render certain particular items without lock-up problems (the DAZ Bombshell hair and Mihai hair spring to mind). Has rendering for such items been made any easier in Poser 6 (a general question). Regarding your own specific lock-up experience, although I would tend to agree with comments in the earlier thread that a scene with four millenium characters might be taxing (certainly to my own system)... is there any possibility that your attempts to render in Firefly are being hampered to an even greater extent by using any similar 'problem' items as these DAZ hair types.