[Client] As soon as I joined a game, my screen would not stop flashing, unless I alt tabbed

I updated my client, and started up a game of Aram an hour or so later. The champion select portion was completely fine and had no errors. After the game started I alt tabbed and left the game browser almost immediatly to turn off music playing in the background. As soon as I opened the game browser again it started flashing between the loading screen and a black screen. I thought it might have something to do with the league merch website that i had open, so I tabbed out again and closed everything other than the client, but when i oppened the loading screen it was still flashing. I waited until I got into the game, but my screen was still flashing. I could move around and even told my teamates what was happening. So i relogged once, which didnt fix the problem. Then I left the game closed everything, and started it up again. But when i got back into the game it was still flashing. Then I appologized to the team that i couldn't play, and am now reporting the bug. Thanks for taking the time to read, and for working so hard to fix us dumb players problems!