May not help, but just to add to the conversation.......

Be sure you check what the Skinning Method is set to.  Several of the programs I use (not Octane, sadly) have a problem with Poser's Unimesh object export.

Just go to Figures>Skinning Method and make sure Poser Traditional is selected.

Like I said, may be of no use at all, but thought it was worth mentioning.