There are some invisible objects/walls in San Fransisco station that cause you to get stuck. It was almost impossible to start the bay area breakdown cause I would get completely stuck at the spawn point.
That's indeed a known bug for quite some time and (as a whole) a sad story ... You may search for the other threads dealing with this topic as there have some workarounds been posted.
I put a ticket in about the same issue recently and the reply was simply that this issue has been previously reported. I assume it will be fixed by the Preservation Crew as they get to it.
