Mac game no longer opens

I alt tabbed to close a youtube video that was playing before I began a game and and in my rush I hit the quit for the league client rather than chrome. I did it even before the champion picture things loaded so I figured I could just restart it and not miss anything. When I went to do so however it opened the the league game screen but nothing loaded and I wasnt able to access anything in the rest of my computer until I forced quit the program then I repeated that process a couple times hoping it was a one(or a few) time thing. Problem didnt resolve and I ended up giving up and figuring I'd just wait till next game. So I tried to start a game recently and the same problem occurred even without me quitting the actual game this time. So yeah you should fix this. It sucks. Gonna try and reinstall now. Thanks.