mac bug

I am extremely annoyed with LoL on mac. It seems that every damn patch there seems to be a problem. I am someone who has been playing league for a solid year and I am very disappointed with riots mac performance. In 4.20 Im currently unable to open the game. I will open the game and it will show the LoL symbol but then nothing will open after that. I am very annoyed and I hope RITO can get their shit together