I'll also tune it up so that if your card doesn't support fbo it will turn that offscreen rendering mode to "backbuffer" by default.

But basically it was trying to use fbos because it thought it was rendering at one size and then going to later on display the final result in a different sized window than the rendering when that's not really what happens. Now that I've got that fixed up it doesn't worry about trying to use fbos or offscreen rendering at all which should simplify things.

- Michael