Hi Team Meat and Meatheads,
I've picked up on a similar problem with the full screen issue. My major bug; which has basically made the playing of this game prohibitively awkward, is the fact that my controller inputs don't correspond to the ones that they should. As far as I've been able to tell, down on the dpad is the equivalent of pressing A. That's about all I've got.
Now. This controller is an unofficial copy of the official white xbox controller. I downloaded a driver from tattiebogle.com. I can confirm that it's not an issue with my other steam games. It works with both my copy of Dear Esther and my copy of Bastion. It's clearly meat boy that doesn't agree with it.
Steam Support tells me that this is par for the course with Mac. But if you guys have any hints or tips, or a better recommendation for a driver, I'm all ears.