Got the mission to talk with Dan at the swamps. IIRC, I need to talk to Vector at the entrance and do the Clear Sky story in order to spawn Dan at the sawmill. Dan's marker is there but the sawmill is empty.
And the problem here is: Vector wont talk, at all... Tried to spawn mobs, quicksave/load etc but he's just blair witching into the wall.
Edit: Went to CS base and could talk to the leader. all working now