Have you updated Poser 6's Service Release 3. That is the first thing that hit me reading your problems. I have Rendered 7 Victoria3 figures with hair and clothes, it took about an hour but It rendered. I have a 2.4 GHrts 512 Ram on my new ADM 64. I didn't want to update that soon, but I had no choice, My other computer lost its hard drive. I will update it to have a duel core a little later.

I don't have an extreamly fast machine for poser 6. The 64s don't work to speed up poser 6's renders from what I' ve heard. And I'm not sure the Poser 7 will at least for its imediate release.