I have had the Render window pop up in the lower right-hand corner of my screen. It was actually off the screen at this point and you could just see a little squeek of the corner of the window. Luckily when I moved the mouse over it the pointer changed and I was able to resize the window and eventually drag it up onto the screen. I've also had it where it renders the image but won't let me use the scroll bars. I have to save it and look at it with another program. This only seems to happen with very large renders. Brian