So i bought Portal 2 and I played single player for a little while and saved my game. Then I played some of the levels other players made. And then next day I get on to play more and everything was working fine but when the game is done loading my save the screen blacks out. It does this every time I try to play a level. Also during the black screen it's like someone is talking but it just glitches out so it's just the same word being repeated over and over. PS: I have already tried reinstalling the game.