There were 2 videos at the end of the Living Story. When they played, there was no sound, and I think I figured out why.
The videos do not use the game’s sound output option. They play outside the game, and the sound is output through the Window’s default output option.
I assume this didn’t affect many players, but for me, game sound is on my 5.1 speakers, and Windows sound output is through my gaming headset.
: (