I just purchased Walking Dead via Steam for my new MacBook Pro 15 (late 2013 with Nvidia 750 GPU). Episode 1 works fine up until you get to the Greene's farm. After you sleep in the barn on the first night and then wake up the graphics get corrupted - you see no characters and the graphics are messed up. Audio and story continues but you can't see anyone or play the game.
Is this a known issue that will be resolved?