Overture from H.I.B. -- Black Screen after Intro

[Sandman]

Hi,

I've just purchased Penumbra: Overture for Mac as part of the Humble Indie Bundle. I'm excited to play, but I'm having a problem: after I click new game and watch the introduction sequence, I see a loading screen. Then, my screen goes black. I hear sound from the game, but I can't see anything.

Any idea what the problem might be? I'm running OSX 10.6.3 on a macbook.

Thanks,
-Noel

EDIT: Ahh I think I know the problem. Pretty sure it's because I'm running an Intel GMA 950 graphics processor, and you only support the newest integrated graphics processors.