Bowmaker of strike?

My bowmaker went on some sort of strike because last night he complained about a lack of resources even though I had wood to spare.
I figured it was just a graphics bug and that it would be fine when I log in again. So this morning he's still complaining on no wood and I still
have spare wood in stock. No bows have been produced for about 8 hours. I demolished the building and made a new one and it started making bows straight away. This bug cost me 8 hours of bow production and a buff.