Well I can get that silly default material reference and I’m not using the bridge! Figured it was a communication bug in D/S but haven’t the wherewithall to verify it properly.
Created .obj in Hexagon.
Drag down material list and delete EVERYTHING not associated with .obj.
Export out .obj.
In D/S import .obj and often as not, one will have extra reference.
Solution is to close D/S, open a fresh Hexagon, import in that last export from Hexagon, again clean up the materials and export out.
THEN open D/S and import it in.
It’s usually clean then.
Now if there are “oodles” of unrequired materials in Hexagon [like from an imported model one was dressing], after deleting the model, export out the “clothing” .obj. Close Hexagon, open Hexagon and import in that .obj file and hope it has only its own materials assigned mentioned in the materials list. If not, delete what remains that is not required and export out the .obj again.
if not sharing/selling said file, one can apparently also just open the .obj in a text editor and remove the reference to the material.