I Play on a Macbook and My Game's Don't Load on New Patch

Ever since the new patch I can't play LoL at all. I get through Champ Select easy but when the game goes to loading, I get a white screen that I can't Alt+Tab out of and I have to Forcequit my computer. Please help, I can't play at all now. Even after shutting off my computer and reloading the client the same thing happens again.