[CLIENT] Blank Screen in Lobby

When loading into ARAM champ select, my screen was blank. My friends list worked, but everything else was blacked out. I was unable to change any masteries or runes. Eventually I loaded into the game (I ended up with Sivir with Eve masteries and runes). When I tried to exit the client prior to game load, it warned me that I was leaving a game and would be penalized (so I didn't leave).

Thanks.