No, I was careful not to press SHIFT+[SELECT].
It's working now, but yesterday if I pressed Select to use the fader to change a parameter and then pressed Select again, the fader did not control the track's volume - it was controlling the Master Fader.
And no matter what I did, including re-installing Core Control, re-starting Logic and re-starting the Mac, the ARM, MUTE, SOLO buttons were not working.
Deleting Komplete Kontrol from the Controller Setup seems to have corrected it.
NI KK was installed first, so that was top of the list.
What happens if NI KK is not top of the list.