I have. My characters won't speak with each other if not for cutscenes or something related to the cutscene. They also repeat the same dialog if the dialog was their last interaction, like if nothing new was said, which seens to be not adding anything on my journal.
When this started to happen is the problem, because at first I just noticed that the character were saying things like "I'm busy" or "not now", but when I went to change than (a pretty long time after it happened, probably) I had done lot's of new things. Meaning that if I want to discover the trigger I'd need to return lots of advancement... Looking through the forum seens like it's happening after the gnome on the windmill, but I can't say for sure (Also, as said, I have done many other things before I notice the problem).
Hoping for a fix that I don't need to go back to the start or something like that.