Umm, okay, so this is a little embarrassing, but I’m going to come clean. As I mentioned before, for as long as I’ve owned the Mojo (~ 2 years), my volume level was always within a few clicks up or down of the double red ball setting.
The key to this story is that for reasons that still aren’t clear to me, in between normal listening sessions, something caused my Mojo to reset itself to very near the lowest volume setting. So the next time I went to listen, thinking I was still in my regular volume zone, but barely able to hear anything, I clicked up the volume button and was almost immediately presented with one red ball (and the other volume ball sharing some of this color presumably through internal reflections). But the sound through my IEMs remained barely audible.
So I kept clicking up and up on the volume past this red zone until the balls were bright blue - a level I couldn’t ever remember having seen before. But still the sound level was very low. It was my belief at this point that the volume was set to what should be a very high level, but that a short or some other defect was interrupting the amp’s power delivery. My fear was that if I went any higher outside my normal volume range and a bump or jostle caused the short to momentarily resolve itself, my IEMs, my ears or both might get blown out. It was at this point that I posted seeking assistance.
Fortunately, with the guidance of my supremely patient and helpful friends at The Source A/V, I learned that the Mojo’s volume scale actually has two reddish zones and that I was operating on the lower one. The bright blue balls didn’t look familiar because they were actually well below my normal volume level. Doh.
Yeah, I felt like a pretty big dummy. I hope your resolution is as simple as mine ended up being.