If you need some one on one help with these issues, you can always contact Support for Poser. I know this guy there that will try and help sort out what the issue may be and give you some ideas where to look.

 

With regards to Rendering... If it seems to hang, look at what is Rendering. That can give a big clue (if hangs Precalculating, you may have two many bounces for some specific item in your scene. Using the Script, to turn down Reflection Bounces and keep IDL bounces the same, may allow it to get over that hurdle.

(I have a Car at night under a street light with a Wet Look Material for the road and car paint Scene that can get hung like that)

ratscloset
aka John