Well, maybe Im wrong. I do understand no audio flows through a DCA channel. But I know Im not going crazy. They worked for a month, then I hit something, now they dont.
What is this "something" that you hit?
If I had to guess, I'd say that you used to have one of the mix bus layers (Bus 1-8 or Bus 9-16) selected in the master section (giving you something to meter), then when you selected the Bus Master layer in the channel section that switched the master section to the VCA layer (with nothing to meter). This is not broken - it is exactly how it should function.