Martin is stuck

Does anyone know the reason for this?
I always have to send Martin to work separately, I can't send him through the employment office. He doesn't have any tasks highlighted, he is not even part of any of the quests. He just doesn't go to work, unless I personally choose something for him.
Not the biggest bug ever, but a bit annoying. We used to have the same issue with a character earlier this year (I can't remember which), and everyone was talking about it on the forum.
Now, I can't find anyone with this same issue.
Ideas?