Strange ..

[cecofuli]

Yes. You can try yourself. The file is in the attachment. Very simple scene.

[Polymax]

I created a scene over again, re-modeled the interior, following the dimensions. And render again. As a result of such errors are not found! I think the whole problem was incorrect conversion scenes from Vray.
In your scene use the Vray exposure, VraySun, VraySky, and there were errors in geometry!
I share my scene:

[cecofuli]

Hi Polymax,
this is not my scene. It was created by SHD =)
I didn't see the VRay stuff inside. I'm stupid! ^_^
Sorry for the waste time!

[Polymax]

Ok. No Bugs here :)!