>I think they just got fed up making Linux work in a realtime enviroment.
Actually, I did ask Hugo and Rob about that when I was visiting, and they basically said they'd love to have used Linux, but due to the MS DRM constraints they couldn't open source it. So they had to find a different OS platform to use, and Hugo said he'd really have prefered Linux over that one (for various reasons).
So it's not a lack of Linux capability at all here, just DRM concerns.
Rob & Hugo are welcome to correct me if I've misunderstood any of that.