Buuuuuuuuuuuuug! Please help! (client crash 6.2)

I'm having an issue where no loading screen appears after champion select. When I go back to the hidden icons, I am able to go back into the client, where it just says 'reconnect'. Even if I try reconnecting, the same thing happens again. I can't even spectate games. I've tried restarting my Mac, repairing, reinstalling and following everything in the support page on how to fix crashes. I know it is not to do with my internet connection, as I have restarted it multiple times. I do not have LolReplay (some have said that uninstalling this will solve the problem, and I am using Mac client) This has only happened since 6.2, please help!