So I was watching a YouTube video in fullscreen and when it ended I exited the fullscreen to find my window borders as if they were the ones in Windows Vista, the individual buttons that look like a cross between Windows XP and Windows 7, not the ones that you'll see if you look up "Windows Vista window borders". As I say this it does this more and more often, at first it was a split second but then it was long enough to observe it. Now it happens when I close and open windows too. What's happening?