As said above, I've completed Nar Shaddaa, Dantooine, Onderon mk1, and now Korriban. However the message to go back to Dxun will not trigger. I am playing on Steam, no other mods installed.
Strangely when I was in the Korriban academy, it was a twi'lek Jedi who was dead in the cage, and said that Vash was in the caves (I do NOT have M4 installed). I've been into the caves, she's not there. My journal says I've found her dead body (again, no I haven't) yet there's an open quest for "Lost Jedi" saying simply that I found Vash's body and it looked like she was there as bait.
In addition there is no VO for Kavee (the padawan on Dantooine); and on a suggestion note, there were wayyyyyyyyy too many Sith Assassins on Dxun when I was about to go to Onderon. It actually became quite boring and felt like it was never going to end.