Won't allow me to load a game, crashes all the time. Patch 6.5 mac user

Hello,

Since patch 6.5 came out, I am unable to play a game and it has even caused me to be reported for AFK (now I'm in a lower priority). Every time the game is about to begin, it crashes, the screen just goes black. I don't know what the problem is. I even tried uninstalling league and installing it back. I am a mac user. Anyone else has the same problem?

HELP!!