Client Crash and game unable to open (with solution) WindowMode=1 bug
This is the second patch in a row where I've had to open $LeagueHome\Config\Game.cfg and manually change WindowMode=2 (also causes the crash with WindowMode=0) to WindowMode=1. You can not connect to a game when this happens (although you seem to make it through champ select just fine).
I can paste my full config if needed.