ok so i have an external HD with all my stuff on it. and i have itunes with music, tv shows, video podcasts, and movies in there. all proper format and everything as they work fine when playing in itunes, and booting off the external hard drive. however, when i go to play through front row, the movies, and tv shows just wont play. there wont be a preview of it, (whether i bought the movie/tv show or it came from my dvds). i wil click to play it, and it will just give the spinning circle next to the title really quick, and just wont play or do anything. music, photos, dvd all work fine through front row, as do video podcasts. only thing that wont work is movies and tv shows, and ive bought them from the itunes store, and they play within itunes...... any thoughts?