In the first Brotherhood mission, after opening the passageway I can't get my party members to follow me. They just stand there. I go to the entrance of the sanctuary and the robot seems to think they've followed me, but when I transition to the new area I'm alone.
Seems to be a bug, but I'm not sure how to get around it. I only have a few saves, pretty much all in the compound. One is hella old...not replaying a bunch of this game. It's fun, but never "play more than once" fun.