I don't know if this will solve your current problem, but someone else here told me that Poser 8 and 7 work better if they aren't installed under Program Files(x86) and in the root directory, i.e. C:Poser 8.  I did as was suggested, and Poser 7 and 8 run a lot better without all the problems under Windows 7.

If using the Library, Poser 8 still has issues with that.  I have problems with library items disappearing then reappearing in the wrong place or when adding items to it they will not add.

Poser 2, 3, 4, 5, 6, 7, 8, 9, 10, Pro 2014, 11, 11 Pro