DAZ does indeed need to fix this. I can duplicate inverted normals on facets like this. It occurs when I cut a mesh up into groups and I do not do it like a wave washing back down a beach. If I go in and try to add in some facets that I missed, this shows up in Poser. It makes it a bitch to group a complicated mesh. If the inverted normals occur as a complete group, the grouping tool can easily repair it. If it is random, I can only repair it by erasing the whole grouping, start with one (the parent) and subtract out the children again. Awful, tedious, and boring. At least it does not effect the mapping.