I had him as a companion and then initiated the Castle quest. He left me to go gather troops outside the Castle. I met him there and completed the quest, and I am pretty sure at that point he wouldn't follow me, but I chalked this up to the fact that I hadn't gotten the radio tower going yet. So I fast traveled to Sanctuary, got the materials I needed, went back to Castle and got the Radio Antenna working, and he congratulated me, and then just like walked away, I couldn't initiate a normal companion/settler interaction, I could stop him and he would say whats up but thats it.

Eventually I found him again in Sunshine Co-op, where he had been stationed before I made him my companion, and same thing he is not intractable. I have tried killing him and dismissing my other companions and lots of other stuff. Have read that several other people are experiencing this issue. Please fix.

Bump, also as soon as I got Mccready's companion perk, every single headshot in the game is 95%. Not working as intended.

In a similar boat with Curie, she acts like a settler and only talks, no dialog wheel.