The map flashes to get the staff but the wagon is no longer clickable. We went over to the gate to try and open it, but it still says go get the staff.
Basically - we can't move on to the next part without restarting the game. We killed a couple of monsters prior to clicking on the wagon, but we aren't sure what could cause this.
Not sure if we did anything weird - as far as we can tell it just didn't catch that we picked up the staff.