Daily Play Mission Bug

Really obnoxious trying to level a new account.

Hovering over the bottom of the champion selection offers two seemingly clickable buttons, However:

when you move your cursor to click select or view abilities, the buttons disappear.

There is no way to escape this screen. You cannot leave it without selecting a champion. Restarting the client just brings you right back here. (Edited to add: This also means I cannot switch accounts to play on my main or any other account of mine, either, since the new client doesn't log you out when you close the window!)

Guess I can't play anymore! Thanks Riot! :)