Ok...I opened  a recently saved scene. Added a poser 5 male figure, posed it and then a poser 5 female figure. While working on changing the material colors poser shutt itself down twice.
Opened poser again changed "Display > Preview Drawing > OpenGlHardware" to "Display > Preview Drawing >  SreeDSoftware.
I went through the same previous moves and poser didn't hang on me again. So far I haven't experienced that behaviour again...was that it?
Let's wait and see, since the problem seems to happen quite randomly.