It was happening to me, too.

only I was using XP Pro, never did get it to work.

I installed Windows 7 and tried it, problem went away... I think,  :) beacuse

 I just went back to Poser 7,  I had no time to mess with it as I was working on a project.

http://renderosity.com/mod/forumpro/showthread.php?thread_id=2818739