How do you get mental ray environment cube node to work?

malcolm

So I have no problem hooking up 6 textures into a maya environment cube node and then plugging that into whatever part of the shader I want it to render on, let's say the diffuse. But the mental ray environment cube doesn't seem to work at all, I put my 6 textures in, plug its out colour in the diffuse colour and it renders black. Anyone ever used this node. The only reason I'm not using the maya node is I've found a bug with it and it would require fixing 450 car models in order for it to render correctly in mental ray.