Whenever I load up the game, it works up until the first menu appears (in this case, the profiles selection/creation screen). It half fades in, then freezes and Activity Monitor indicates that it stops responding, though it continues to use 100% CPU. Thank you for any help you can provide!

I am using a mid-2010 MacBook Pro, 2.66 GHz i7, 4 GB RAM, on OS X Yosemite.