Hi all,
I have been using small little MIDI files that I send with MainStage to set the input on the KPA (enable/disable SPDIF). Last night, I was going to use only the digital input, so I locked it. After that, every time I changed patches in MainStage, the KPA had no input signal. Rebooting the KPA would fix it. After lots of fiddling, I finally found that if I didn't send the MIDI command to enable the digital input (in this case unnecessary) everything was OK. I did not try again with the input unlocked. Maybe later today.
Thanks!