Please help: V4 rig issues after character injection

Morpheon

I've got some V4 characters that were created by another artist in DS3 and then exported out as pz2's. When I use these characters in DS4P, they appear to contain some kind of bug that displaces most of the rig, making posing impractical and unsightly (especially the hips and legs: they bend and distort like warm Silly Putty -- it looks awful). Even tho' this displacement occurs in DS, it doesn't occur in Poser, for some reason.

What I want to know is:
1) what's causing this issue, and
2) how do I fix it?

The first picture is the base V4 BEFORE injecting the character morphs. (I have the Joint Editor tool selected so that the figure's rig is visible.)

The second picture is the figure AFTER injecting the character morphs, and you can see that the rig has been scrambled.

Thanks...

NOTE: For some reason, the forum transposed the images, so the picture on top (the one showing the jacked-up rig) is actually the second picture, and the one on the bottom (showing the normal rig) is the first picture.