I'm not sure if I am doing something wrong or it is a glitch. In the game XCOM, UFO: Enemy Unknown, I was playing normally. I shot down a UFO, went to go kill the survivors, went into battlescape, then for some reason I decided to click on the little gold icon that brought up the stats screen.

You can see this icon here, it is labeled as [16].

Now I have this stats screen open. I cannot close it. The music is still playing, the mouse still moves around the screen, but no amount of clicking or mashing buttons has made it go away. Am I doing something wrong or is this just a glitch?