Basically what the title says.
Since about two weeks ago (guesstimated) I have no sound on Oculus Home, Touch Basics and First Contact.
Strangely, while the Oculus Home environment is dead silent, I do have sound when I bring up the in-game Oculus menu (the one with the screen floating in front of you and the button bar at the bottom).
Also, all other apps work perfectly.
Oddly enough, First Contact is malfunctioning in both its built-in and downloadable versions.
I haven't read about anyone else having this.