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Imported .OBJ problem - low poly is modified when using subdivision


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I hope the subject line makes sense...  When I import an .obj for per pixel painting, etc., if I use subdivision then the low-poly version of the model is modified slightly!  If I don't use any subdivision, it retains the correct shape.  I can reproduce the problem.

 

Long story: I noticed this when did some UV-ing and painting in 3DC, then I used the applink to import an .obj back into Blender directly.  I realized the face material declarations weren't kept when importing the .obj via the applink - everything was assigned to one material.  So I figured, what the hey, I'll import a previous version of the object with the face material assignments, and just transfer the UVs and maps from one to the other.  When I imported the previous version however, the vertices didn't match up exactly with the low-poly version exported from 3DC via the applink. 

 

This is kinda problematic, but it's not a deal-breaker, of course.  I can do my UV-mapping without subdivision, then import the object back into Blender, then EXPORT AGAIN, and use subdivision for painting, but that seems like a few unnecessary extra steps ;)

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