Has anyone noticed companion issues during the attack on the legion from Hoover dam? I had Arcade and he just followed me around (refused to fight, wouldn't trade weapons (I had to fight it out with primarily the anti-material rifle and ballistic glove) and Ed-e completely disappeared. Not that I needed those chimps, but I would have liked some of the AID they were stowing for me. (also didn't notice any of my achievements firing on screen (checked later they did count and give credit). Great game just wish I hadn't gotten derailed 2/3 through and had to backtrack. Now if the Devs can just get the bugs ironed out before my third playthough so I can get all my achievements).

There's a bug with companion pathing at Hoover Dam. If you go out of the visitors center using the ground floor entrance your companions will attempt to run upstairs to the observation deck exit. Sometimes they'll make it if you run around to that door, sometimes they get "stuck" in the visitors center. Until this is fixed I suggest using the observation deck exit.

Not the stairs which require a key, but the door next next to the "hard" level locked double doors upstairs in the visitors center.