V-ray not rendering transluscent walls

[Action]

there is a particular section of transluscent walls that doesn't render for this art gallery i'm designing. It just turns blue, even though I put a transluscent material there. Anyone know why it does that, and how I can fix it?

[stefanq]

try to reverse that face, it could be inverted

[thomthom]

Got a screenshot. That gives us a much better idea of what's going on.