I don't recall anyone else having this issue...
Some people had a similar problem talking to the 4 sleeping people in Broken Valley, near Bellagar's shrine in the bandit area mountains. The workarounds in that case were to either save before talking to each person, and then just reload if there was a problem and try again, or after exiting the conversation quicksave when stuck, exit the game, restart the game and load the quicksave (which should get everything back to normal).
You could try a clean re-install of the game; in case there is a problem with that particular cutscene or dialog file.
