OK, sorry about resurrecting a thread that seems to be long dead, but I have a similar problem. Korriban/M4-78 were my last planet. I killed every jedi (T3's list states all as deceased), including Vash. The "Lost Jedi" quest is updated at I defeated Vash in the M4-78 central core or whatever. However, Kreia cannot/will not talk to me about going to Dantooine. I'm not sure how to proceed. I'm using the Steam version of KOTOR 2 with the Workshop versions of TSLRCM and M4-78.
Edit: Apparently, I can just walk into the Dantooine academy without the Kreia conversation.
2nd Edit: I'm guessing this is related, since I've never seen these issues with the main plot before: now I'm at the Telos Academy. The whole place is empty, but I can't enter the meditation chamber where Atris should be. Also, if I return to the Ebon Hawk, Handmaiden is on board, acting normally. Kreia is, however, absent as she should be.