The cobbled swan case ( I'm stuck)

First off, I don't know if this makes any difference, but Minrathous has been devistated by that first big choice.

I've now completed the battle at Weissenhop, Neve has a quest at the cobble swan.   We go to the  quest location.     It's at the border between the side alley bridge and the wharf crossing north.   I start the quest.

From that point on, every path out of wharf crossing north is closed.     

Am  I bugged?