I know this thread is really old, but I have the same problem stemming from the Telos Academy (chose to lay down weapons imediately), but it is Bao Dur who i cannot speak to, not Atton. Is there something I can edit to make him work properly again?
edit: Kreia is bugged as well, as with other people, but it is Bao Dur I am most concerned with, since talking to him is required to build a lightsaber.