Okay - I initially had this problem, visiting Dantooine first, Light-sided, and leaving the Redemption quest open.
I then replayed it, changing nothing except moving from a male to female character, and not picking up the Redemption quest.
The game played smoothly all the way to the abrupt (and rather easy) end.
Ah well.
Now to play it Dark Sided.
Let's hope the next RPG game actually has the full 3-dimensions as opposed to the paltry pseudo-3D that this has.