Yup. Jumping back and forth to wings with morphs will change the vertex order. It's happened to me. The solution is to always work from a fresh copy out of poser rather than multiple edits of the same morph target over the same exported obj. Here's the workflow for wings...

1. Load your morph target onto your model in poser. Dial to 1.

2. If you want to further refine your morph in wings export that morph dialed to 1 from poser as a second wavefront obj export and refine that in wings. Straight one trip out, edit, one trip back for each successive refinement.

3. Reload as morph target this second edit. Dial to 0 the original version first. Dial your new edit to 1. Delete the original morph if you like. Click the little arrow to the right of the morph dial. Delete morph ( I'm not at Poser right now, so my naming conventions might be a little off). Also be careful to not have like named morphs. Always try to have unique names for each successive edit (numbering works fine).

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