Thanks aRtBee

the trouble here is over the

couchs

 

I played with all the possible combinations, but the problem does not disappear.

that's why I asked you and to BB the settings for BB's dome and sun light.

I think the problem comes from external light

this is the render

I have made a test with M4, the same problem is over the M4 skin, but this is a future step.

Poser Pro 2014 SR 1 on Windows 7 64 bit
I use IDL, Gamma Correction and EZSkin for all final renders.