No HUD all game
Just finished a game (ARAM) in which i didn't had a HUB. Searched online for help, while in-game, found that it can be resolved with alt- , tried it nothing worked. Was it a bug or something? 
P.S. somehow we won, but i want to know what to do if this ever happens again. It's hard not to see your cooldowns and the mini-map or the score.. Also if i pressed TAB nothing would happen.