Whatever you do, DO NOT leave a TFT game!

Either surrender it, or wait until it is finished. If you leave prematurely, you will be stuck out of LOL and will no longer be able to use the client. https://i.imgur.com/czFRxoI.png I tried restarting the client, the PC. Nothing works. So whatever you do, DO NOT HIT THE EXIT BUTTON!

LE: Full repair helped me. Got me into the game, then I had to relog (again!) to be able to see the buttons)