[CLIENT] Client blank in champ select

This has happened to me twice now where I get into champ select and I cannot see any of the panes - no champion selection panes, no summoner panes, no pick/ban panes etc. Client window remains open with the summoners rift background image, and I can hear timers, but can't actually do anything. Randomly clicking (in attempt to ban a random champ that I cannot see) does not work - the sounds for picking / banning a champ do not occur. Forced to dodge twice because of this crap. Hoping riot will fix this. Could not find another thread on this issue so thought I'd make one, sorry if there is another. Will try to get a screenshot next time it happens - was too frustrated this time to think of screenshotting.