Near-Completely Dark Window in Champ Select
I was picking my champion in champ select when someone dodged the queue. I was then put back into queue, and had a series of rapid games pop up where I clicked accept on all of them as they popped up, but none of them were formed. Eventually all 10 people clicked accept on a game, but I didn't make it into champ select. I was left with a completely dark screen where the client should be. I knew we were in champ select because if I tried to close the window, the window with the "If you're in a league series it'll end your series" popped up. So I sat there for a while sitting at a blank screen, and eventually I was kicked out because I couldn't ban a champion, and now I have to wait 30 minutes before I can play again, because of a bug in the updated client.
It was in my series to plat, by the way. If this costs me my series I'm going to be pissed. I was 2W/1L so far.
UPDATE: It didn't cost me my series, but now I'm 2W/2L. Thanks, client.