hmm... weird problem. :think:
I think it might have to do with the engine itsself. If so, i think the code that determines the backbuffer size, might be wrong. The easiest way to get a backbuffer size, is to take the dimentions of the window, and use them as backbuffer size. This method works but it's not entirly accurate, because a window has borders which are taken into account when you get the window size.
This means that the display-area is not the same size as the backbuffer. The backbuffer is stretched/cropped into the display-area, which might result in some artifacts.
I dont know how the backbuffer-size is determined. I haven't solved this problem myself.
It's just a hint, that might lead you to the sollution
Good luck.
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