I'm really going to have to agree with this. I too liked being able to watch a render as it was going. The preview window, if you're rendering bigger than the preview window itself, is useless for the comparison feature (which I really like) unless you just want to compare the upper left hand corner of the picture. Oddly enough, I have only had a few "silent hangs", and in all cases I was using a certain prop from Daz. Taking out the prop stopped the render freeze. Sorry I can't remember which one at the moment, but will post when I do remember it. Other than that, P6 has always popped up a box about memory if it fails. So chances are your render is still going, just really really slow.