I'm having the same problem.  It renders fine in draft, then when it renders in final all I get is the background shader.  First time it happened it was a blank gray, next time it was a blank black.  Both times that's what color the background  was.  So I switched to Poser 4 render. Same blank render... I went down from final closer to draft. Hoping that at some point it would render okay. It didn't. Instead an error came up about having a bad texture file.  

This has been most frustrating because part of this scene is simulated cloth, which has not been saving correctly. Each time I open the scene I have to re-do the simulation. Grrr. And with Poser7 crashing I had to re-do the simulation alot.  

But I did manage to get a final render of just V4, the cloth simulated skirt/top and two props. Sized 1000 x 1020.  

I'm testing it to see if Poser will render the other part of the scene in final.

The only thing I don't procrastinate is procrastinating. That I do right away.