'To make doubly sure, load it into UVMapper and Weld Vertices.' Don't make doubly sure! Don't do this. You only want the wertices between the body parts to weld. The modeller may have left some other parts with split vertices deliberately, depending on the character, and if you hit the 'weld vertices' button in UVMapper, you'll totally hose the split vertices and when you apply auto-smooth to your imported figure it will quite possibly goof up the smoothing just as Poser does when you weld identical vertices on import for something that you shouldn't (most things).