Arcade have trouble joining when ED-E is with you. Send EDE to 38 and ask again. However adding EDE after Arcade joined is no problem. :hugs:
Note: old glitch or is it intentional?? :shrug:
OK Daveh, tried this. Dismissed Ed and went to Arcade, and instead of the generic responses, he actually had the prompt for me to ask him to follow me...and he said "you've already got quite the menagerie" and I was told I can only have one companion...when I had zero. On a hunch, I went back to the 38 and invited each companion then dismissed them. Each allowed me to invite them, so THEY didn't think I had companion issues. I went back, Gannon still wouldn't join.
Then I remembered, Rex wasn't at the 38 for some reason. I went to the Kings, he wasn't in the lobby. As I went upstairs to find him, he shot past me running downstairs. I gave pursuit and he vanished out the door. I went out, and he bolted for the strip before I could talk to him...he runs a *LOT* faster than I do. I got to the strip door, went through and snagged a convo with him before he bolted...he was still my companion, though he wasn't before, I had Ed and Arcade. I told Rex to go back to the 38, then went to the 38 to check, he was still there.
Back to Arcade, still things I have too many companions. Any more suggestions? BTW, thanks for helping me on this, I really want to do the Enclave quest so I need him.