Okay, so I've gotten to the point in the ED-E My Love quest where I can take ED-E to either the Brotherhood or the Apocalypse guys. When I go for the Brotherhood, I go down into the bunker and give them the correct password over the intercom. The guy says they'll be right up to meet me, but they're immediately hostile and attack. What gives? I've never even run into them until this point.

Are you wearing an outfit that disguises you as another faction perhaps?