In an item I just installed, the readme said, "In the mesh files the texture map coordinates are upside down, to allow for Poser reversing them." In this case, it was referring to "reversed" in relation to Bryce. This is the first time I've seen anything relating to texture reversal in Poser. I don't know if it's related to what you're seeing or not.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken