I don't think you should focus on this to much but just wanted to let you know.
I use a laptop with an external monitor attached to it. I edit my game (in C2) on the main display of the laptop and preview it on the external monitor. The main display has a resolution of: 1366x768 and the external monitor a resolution of: 1280x1024.
Now what happens :
It looks like C2 tries to shape to the ratio of the external monitor on the main display. Resulting in an empty space at the right of the screen and the bottom of the C2 being out of the displays height.
None of the other windows does this so I figure it's something in the C2 code.
It's easy to fix by first minimizing and then maximizing the window.
Like I said it's not a big issue but it would be nice if you fix it when you're bored or something