Still, I figured out what was wrong. The ESB and RotJ just do not play straight away when inserted. You have to press the "next chapter" button on the remote for the movie to start playing. With ANH, this is not necessary. I first burned ANH and tested and it worked and played fine (without pressing the next chapter button) - then I was confused when ESB and RotJ didn't seem to work likewise. Mind you I'm only talking about the Farsight set here.
Thanks for bearing with my newbieness
Oh, did I mention that it would be silly to master a work of art into single-layer format since dual-layer is just around the corner?