I haven't encountered this problem up to now. I will try to simulate that effect for understanding it.

What kind of lights do you use? I see almost no shadows, are they switched off? Do you use a skydome or an IBL? Was indirect light switched on? 

 

*edit:

In one of the skin threads at RDNA someone had a similar problem, which was caused by the ambient light he used. Could that be a reflection from a sky dome ? 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

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