By the way, confirmed: My just switching to software rendering on the preview window the crashes stopped. I didnt even updated my video driver. I'll try updating as well, but glad the problem is gone now.

One thing however, on the Material window, moving the materials around is so slow! It was so fast in Poser 7 (pro), and either with OpenGL or software rendering they're slow to drag around in Poser 8. You can see them redrawing at each step they move. Not sure if this is also only on my PC...