I only recently noticed this after saving the gnome from the windmill.
I could no longer talk to any of my active party. I went to camp to attempt to swap them out, and I could not talk to any of them. I could speak to the companions who were at camp but not actively following me, but none of the ones in my active party responded in any form when I clicked on them to talk to them.
Unfortunately, I cannot pin down exactly when this occurred.
I'm attempting to reload a save and find a point in which this bug wasn't present, but I'm running into a different issue where any attempt to load a save mid-game and while in a fight, it results in the game not responding and not loading the save, forcing the game to be force-closed.