Last night I had a misbehaving fader on bank 2 of my Avantis, so I ran a fader and motor calibration. After it was complete, the gain law on all faders was ruined to the point of making the desk nearly unusable. Unity was now referenced to +7.2dB. Attempting to lower the fader to get 0dB was no longer possible. As soon as the faders would get to +4.2dB, the level would drop to -10.9dB, a jump of about 15dB which of course is impossible to use. I reran the calibration several times, power cycled the desk, tried different show files, etc. Nothing would restore normal operation. Fortunately the gig was just a comedy show, so a couple of mics and no monitors. So I was able to get by mixing on the gains and leaving the faders alone at their lowest high range setting of +4.2. I had to gain down the system processor and matrix sends to compensate for the over hot levels. If this had happened with a full band, it would have been a show stopper.
I took the desk home post show and tried a couple more fader calibrations but the result was the same. On a hunch, I decided to back rev the firmware to 1.31 and run a calibration again. This fixed the issue. I moved the firmware back up to 1.36, but I certainly won’t be running any fader calibrations again on that build. I’ll leave it up to the A&H QA folks to try and repro this issue, I do enough QA work at my day job 