Curious problem after many years of stable HT operation. Today my wife was watching Out of Africa with some friends and when they got to the 3rd chapter (where Meryl Streep goes into the old boys bar, the dialog channel dropped out. I ran the channel ID with signals generated by the preamp, and everything was fine. Then I used my Avia test DVD and used the signals there. That was ok as well. I tried a different DVD player with the same result.
Finally one of my neighbors went home and returned with her copy of the movie: same dropouts! Other DVDs played normally.
Question: How likely is it that 2 copies of the same movie demonstrate the same flaws? Or am I overlooking other possible causes?