...also, If you ever end up with "default_grp" or "default_rgn" or "default_mat" when you import some .obj file (they used to all just be "default", but I changed them a few revs back), then the polygons in those tags were not already assigned to some other group/region/material.

I usually use this as a test when I export some new mesh... I re-import the mesh and look for those tags.  If they exist, then I probably missed an assigment somewhere.

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