client not working post game.

Recently my client has only been showing the very top left corner when i get out of a game and I have to task manager the client to get it to close so that I can relaunch it and hop back in que. The only way I know of that prevents this is to set the client to close during a game, but that also REALLY annoys me because it takes forever to open after the game is done. Any known solutions? My computer is more than capable of running the game/client at the same time so I have no idea what to do.