I have been using Poser 6 over the weekend, although I do also have Poser 7 ( was checking out some python scripts ).  I found that Poser 6 is very much less stable than Poser 7 and will exit or hang more easily for a variety of reasons, not all obvious.   I'd really have to admit - Poser 7 is much better to work with.  Move to Poser 7 if you can.

Eternal Hobbyist