I can launch the app, but after I click 'continue' and the app connects, all I get TWD splash screen and scrolling text promos at the top of the screen. I've waited quite a long time to see if there was a load issue, but this happens every time.
The OS X steam version installed and runs.
OS: Mountain Lion 10.8.1
Processor: 2.93 Ghz Intel
Memory: 8 GB RAM
Hard Disk Space: 208 GB Space Free
Video Card: ATI Radeon HD 4850 512 MB