I have had the same problem. It stops rendering.I render to screen that does finish all the way.The same picture I was trying to render to disk took less than an hour to render to screen. I also find I am having a problem importing certain pz3 models. The problem only occurs when there are alot of transparencies involved(the seanymph model from Daz is one that won't import, I have to make it an .obj and add the trans. separatly) Marge