New Release: Realistic Rendering Showcase

Looking really great from what I can see in the screen shots and videos, but not on my machine.
It is way too dark in the corners away from the window up to the point I can’t see a thing.

I’m on OS X Mavericks 10.9.2
Graphics NVIDIA GeForce GTX 680MX 2048 MB

Is this a DirectX 11 issue? Does Open GL require other settings to render well?

Thnx