OK, so I reloaded and played through from the HK factory onwards, got to the same point and the same thing happens...bugger. Don't know what I've broken but I've done some googling and can't find anyone else with the same issue, so it must be something I've done. Oh well, looks like I won't get to see Kotor 2's famously disappointing ending after all.
You're not missing much. Kreia has some interesting info to reveal towards the end but beyond that it's entirely forgettable.