I had similar thoughts about the video card, although I wasn't doing a GPU render. I'm not always sure on this particular machine how that works. You see it's a laptop with two graphics cards, and integrated Intel one for when I'm running off the battery (which I was) and then a more powerful nVidia one. Because I was having a bunch of other little problems, I've reinstalled my system, which seems to have fixed a lot of things, but I think maybe there is some sort of permissions error that crept into Poser. I just haven't figured out if it's just in the one folder I have the python scripts, or it's elsewhere.
Wow, I have enough problems with only a single video card! >__<