My guess is that some rounding or precision error is involved when vertices which may exceed the precision with which Poser operates internally are duplicated and the duplicate vertex is automatically but incorrectly modified by the arithmetic precision limits being applied.

The hardest part is that when saved as a cr2 file, another, separately grouped obj file which contains the duplicated vertices is created with the cr2. That same cr2 can be edited to point to the original obj file with no duplicated vertices and appears to work correctly as a figure, except that the same, unwelded vertices break apart with the morphs.

Again, it's not the morphs that are faulty here (they're not failing to include the unwelded vertices), it's the internal, grouping weld failure that prevents the morph from moving a vertex in the adjacent actor that should be welded across the joint seam.

... On second thought, my original guess is probably not quite right to the extent that it's excess precision in an imported object. A test with the original object imported to Poser, having another, unrelated group added without entering or exiting the setup room, then saved back out to a different obj file (as morph target, include existing groups) and that object editied into the cr2 file, shows exactly the same effect as the image in my last post. Incomplete welds breaking when morphs applied to one actor.

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