Recently I've been making morphs as I import an object that will be attached to another within Poser. I export the base of two objects, then create the morph and then export those two as one.

But I noticed that Poser adds ":1 & :2" to these to the 'usemtl' sections in the new objects you're making with a Poser OBJ export.

Is there any way to avoid this?

I suppose it's not really that big of an issue however I do open the OBJ files and edit out the ":1 & :2" from those usemtl sections before I import them back in to Poser so that they're all consistently just what I intended the mtl to be named.