I have Super Meat Boy from Steam on my Macbook Air running OS 10.8. The game starts up, I can get to the main menu fine, but once I try to load the first level I see the opening game animation and the game immediately crashes once the video ends every single time. I can't play a single level of the game. Any idea why this is happening or suggestions for what I can do? I really want to play this game but can't even get started.