[TWD] Mac - Game not launching properly from Steam

So I am playing on an iMac with OS X 10.6.8. Graphic chipset is ATI, Radeon HD 2600. I am accessing The Walking Dead through steam. The first time I play it after downloading the game, it loads fine. Played thru episode 1 with no problems apart from a minor mouse sensitivity issue in the pharmacy. Got to episode 2 with my choices intact. Closed the game.

Next time I came back to play the game, I attempt to launch it from steam. I can't see the main menu of the game. Instead the opening screen is corrupted, with random blocks of color on it and what looks like some kind of signage interspersed in the randomness. I get the sounds of birds and wind from the menu screen playing in the background still.

I don't understand why the game worked fine that first time I started it up, but turns in to this mess when I try again at any point after. Has anyone else had this problem?

Thanks in advance for any assistance.


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