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This is a Windows 10 thing, or at least not entirely not a DisplayFusion thing as far as I can tell. The new 1px window borders in W10 are actually bigger than that but the extra area is transparent. When you use screen edge snapping in Windows things will appear to be in the right place and flush up against the edge of the screen, but if you close and reopen the program it will be shifted away from the bottom, left and/or right sides of the screen to make room for the invisible window border. The top/title bar of a window doesn't seem to be affected.