Player Window has disappeared

[Yajirobe Yajipants]

My player window randomly disappeared. I play in windowed mode. When I swap to fullscreen, it's there and where it should be. Swap back to window mode...gone again. I went into fullscreen, moved it to the center of my screen, locked it, and went back to window mode. It's still gone. I've hit ALT+Y a billion times and still....no player window.

I've changed nothing regarding UI/ini files. It's just randomly happened. Any ideas/solutions?