Same issue here...I only managed to get one thing to render (and sure, it was fast...but 9 out of 10 times I got the memory error or it wouldn't load the textures...boo!), and when it did - it only rendered HALF the picture.  Didn't give me any errors on that one, just...stopped.

I've reloaded the file in Poser 7 and its rendering away merrily now. I'm sure it will take longer this way, but at least I'll have something to show for it when I'm done.

Guess they don't call it the "Bleeding Edge" for nothing...LOL!