I clicked on the unlink button to unlink, clicked the stereo button to go mono, and now I can’t get back to linked or stereo. As a matter of fact, I had the right channel turned down when I was unlinked, and now, only sound comes from the left channel. I can “link” the channels, although the button reads unlinked. I can see a stereo signal, but only sound from the left, and the button reads mono.
Try reset Master Section Gain/Faders
ctrl + left click on fader
Thanks! It worked.