[client] Champion Selection goes black, or freezes

Since this morning I've been struggling to play, the champion selection screen goes black, and this last time I was stuck in the champion banning stage, with it doing nothing after a few seconds, booting me out and now making me wait 15 minutes to be added to queue. Its let me through a few times but its primarily going black. I've tried to run the repair tool to little avail. Is anyone else having this problem?