Since it looks like the save is causing the crash, it is possible that an AntiVirus program interferes (as Laurie suggested). With a single figure, I don't think it is a memory issue, but it does not hurt to check: Look at task manager and see how much memory Poser uses. If it is approaching or getting over 1.5GB you might be in trouble here.

Ah, and one thing I forgot: Have you disabled Multithreaded Bending in the General Preferences. That seemed to cause some problems as well