Create audio channels, insert Console 1
Add VCA to audio channels
When VCA is 0db, channel faders are controlled correctly by Console 1
When VCA at any other position channel faders jump erratically
nb. Fader movements by mouse or other means (in my case Faderport) behave as intended
My system is Windows 10 Pro x64. Not tested on OSX but I guess its system independent and rather an issue with Console 1 reading volume value when it needs to calculate VCA volume and Track volume.