Mac Demo crashing (OS 10.7 Lion)

So I downloaded the demo for GDT and installed just fine. But when I open it up, the application only shows a white screen for a bit and then crashes. Every time. I’m not sure which section of the crash code I need to paste (I’m pretty nooby when it comes to this stuff), so if someone can let me know which part I’ll gladly post it. I just really wanna play this game.

Thanks

Sorry. My OS is 10.7.2 if that changes anything.

I know this sounds odd, but can you try disabling your internet connection before starting the game and see if this changes anything?