Yep, I have been unable to play for well over 2 weeks. Riot has confirmed the issue but hasn't given us any insight on whether it's even getting fixed. It seems 2 patches ago they messed up their security settings making the game client unidentifiable by macs firewall. Once you force quit out of it you get a security message asking to allow or deny league. The stupid part is that league is allowed on the firewall but continues to ask you the question EVERY time you try to reconnect to the game. Rinse and repeat, just an endless loop of white screens and asking for connection permissions. A massive part of the mac community is missing out on worlds content because none of us can even get past the loading screen. Oh one last thing, you can use the force quit keybind to get out of the black/white screen so you don't have to force shutdown your computer.