You can invert a surface if it is black in Poser.  Sometimes when a surface shows up black in Poser is because it is sort of inside out.  If you invert it in UV mapper it is turned to the right side and should not be black in Poser. 

But if you have a surface that is next to, I mean really close to another surface, Poser looks at it as 2 surfaces and will turn it black.

2 separtate subjects here.  Sharen