Unity 5 GI too dark in Rift?

This is a very strange thing happening. It seems like, though it looks fine through a normal camera and in the scene, through the rift's cameras it appears as though there is some element of GI missing. It might even just be the ambient light, I'm not sure. But in the scene viewer, while in playmode, everything looks fine, but in the rift's cameras it is dark in some areas.

(the blue in the top is intentional, there is a window behind you)