In Inquisitor Martyr,  I can no longer progress in any of the story missions.  I am on the Van Wynter Legacy "Escort the rogue trader..." one.  In co-op (with me as primary), a friend and I did the previous mission together.  He got credit and can go to the next mission, while I cannot.  Solo, I can't do anything.  We jumped into a game with one of his characters that is 30 lvls behind me, and it still pops the "user has not progressed far enough in the campaign" error.

Is there anything that can be done, or is my only option to start all over again?