Lol showing nothing at post game results screen (Client)

Every time I launch league and play a game in the post game results screen the screen turns black and nothing pops up but it will still allow me to exit out by clicking the x then yes. Step 1.Launch Lol Step 2.Start matchmaking lobby step 3.Find game and play Step 4.Go to post game results screen This bug happens to me every time I play though a league of legends game and get to the results screen.