Major game client bug

Crash Report #141692766

So what happens is the game starts up when the pick are over but then the screen will not pop up and when its finished loading you can hear yourself in the game and even hear people pinging but the tab is gone and nothing to click. So I had to force close league of legends and restart up again for it too work. 1st time it happen I was using curse and it said a 3rd party app crashed LOL. So I got rid of it then thought everything was fine till it happened again. This has been happening when patch 6.7 came out...