Thanks Eddie.
I'll keep an eye out for that. Separate to the issue I'm having problems with, as you say.
FWIW:
On my system, when I load a project, even though a channel appears to be selected, nothing appears on the Dock channel until I invoke a layout. At that point the Dock channel displays (what I think was) the last selected (and saved in that layout) channel, as the system now changes the DAW-highlighted channel to a new one. Touching the fader shows the correct pop on Avid Control on the Dock.
Sorry,. That's a lot of "channel"s...
Cheers.