[Client] Black Screen of Death.... Sorta

So I was playing some ARAM tonight and the first time I went into champ select, everything in the client went black except for the border and the bottom buttons. I could still access friends list and chat boxes, but I couldn't see anything or change anything in the champ select screen. Luckily the first time it happened, someone dodged, and it was fine the next time. But it happened again, so I figured I should report it.