My infant son got to my 2012 MacBook pro and started mashing buttons. He must have turned on a feature that I am unaware of and therefor cannot turn back off. There is a small grey frame around my entire display that actually blocks my mouse functions. For example, if the red x that closes a window is in the top left corner and thus under the grey frame, I cannot click the x to close the window. This is true for every program except the force quit. Force quit shows up on top of the grey frame and allows me to interact with it just like normal. Any ideas? Here's a pic to show what I'm talking about.