I don't know, but in the
***Gameboomers walkthrough*** it says
Note: When Lea arrives back at CT6T, I recommend that you not continue into CT6C, and be sure to save your game here. Once you go into the other room, you will be engaged in a looping conversation that cannot be broken by a Save or even a Quit without an error.
not long before the part about the traitor. Maybe it's just a matter of replaying part of the game a different way than you played the first time.