Uncheck that Reflection_Lite_Mult box and re-render. That particular feature should never be used except when working with a very reflective surface. This is really an obsolete feature that should be taken out entirely. Unticking the box might eliminate the dark areas in the P12 render, but I couldn't say for sure. I am leaning away from using the PoserSurface for Superfly renders where there is a better alternative.