I've encountered what appears to be a gamebreaking bug.
In the secret tomb on Korriban, when I arrive in the room with Revan and pick one of the dialogue options, nothing happens. He does his little point animation and then just stands there in non combat mode. I can talk to him but it just repeats the dialogue options and the animation before returning me to the room unable to initiate combat with him.
I can walk around, loot the sarcophagus and leave the room, but I can not open the other doors in the room nor can I leave the tomb. I'm stuck until I figure a way to fix this.
If it matters: I chose to protect dark side Kreia, to walk through the mines on my own, and I told Malak I would fight in the wars again but I would not join him in the dark side.