Just to be certain, I did a little experiment in Poser: I turned both the tongue and the mouthInner material pitch black and looked into Antonia's mouth to ensure they really looked black. Then I inspected the abdomen closely. No black spots, not even deep within the navel.

Still, if someone figures out what caused this glitch, and if it can be traced to some peculiarity in the .obj file (the order of group and material commands or whatever), I'll be happy to try and reformat the file so that UVMapper is happy.

-- I'm not mad at you, just Westphalian.