Here is what I did...
I run Ubuntu 8.0.4 64 bit.
Bad news... if you run Poser with FireFox 3, it seems to lock up the machine.
Good news. I got it so Poser 7 runs well (as long as FireFox is not running.) See the screen shot.
Config. Used the XP bottle with IE installed and crossover HTML engine. Had no issues registering and was able to get in and run the app with few problems.
Issues:
1) Windows show up behind the main render window. This includes windows from other applications like the screen shot one.
2) Refresh rate is a bit slow. When you move into a new screen like the face room or the materials room, it take a little while to refresh.
I am going to try to add more content and try a more difficult scene tomorrow... if I have time.