Got the exact same thing with Piper and codsworth, not the power armor part, but the talking. I can't talk to them. No one replied to my thread either...
I cannot speak to my companions either. I think it started with Piper. Now I cannot complete the "Reunion" mission, because I cannot speak to Valentine. I relied wwaaaayyy too much on quick save and I really should have know better. I'm gonna go cry myself to sleep now lol.