Bump. Tagging on to old thread.
Same problem here, using digi 003 rack.
It worked fine until last night.
I can hear the input and signal shows on main output bus, but no signal shows on the input meter or channel fader, and it's pure silence when I try to record on that track. Restarted all hardware and software, no change. All software and drivers are up to date, running on new MBP.
Very frustrating "tech" issue in middle of creative flow.
Gurus, please help!