Last update when running a game in full screen mode and having it upscale to a new resolution, it'd perfectly match the screen size without an issue. After the new update however - when I have a game run in full screen mode it's slightly off. This was a problem that seems to come and go with updates.
My game runs at 640x360 so it should be able to upscale to 720 and 1080 properly but when the game is run in full screen it's off by 1 pixel vertically. Directly in the center of the frame vertically it's being stretched out by 1 pixel, squashing a pixel off the bottom of the frame and extending the length of one at the center by too much creating an inconsistent ugly result.
How it should look: http://i.imgur.com/ObBiJVm.png
How it looks: http://i.imgur.com/F0UZCmL.png
You can see at the very center that the pattern is thrown off and looks jarring. Of course with aliased upscale you won't see this, but the game is using pixel art so we are not using smooth upscaling.