OK, not disappeared, but it's 1/3 as loud as it should be, and flat and hollow when I crank the volume up trying to get some audible level.
Things I've tried:
Log off and restart my computer, and then restarting MC28.
Cycling the power on my preamp and power amps.
Make sure I'm playing from the correct Library and Zone.
Double checking my stereo's "chain". My Schiit Eitr is on, preamp is on not muted and set to Eitr, power amps are on.
Double check my Zone/ Zone Switch: Player -> Zone (2channel) -> Zone Switch (plays [Audio] in 2-channel and stops play in Zone Multichannel).
Double checked Tools -> Options -> Audio -> Audio Device (Schiit Eitr, WASAPI), device is open to exclusive access, device volume is maximized.
In Windows: Settings -> Sound -> device is Schiit Eitr, master volume is 100%.
[EDIT] checked the physical connections of the various cables.
Any ideas about where else I can check? I am stumped and music-less. Arg. The weird thing is everything was working fifteen minutes ago, and suddenly everything went quiet. I didn't stop MC28, adjust the volume or turn anything off. Very Strange, it's like a setting somewhere changed itself.