Is this happening to you upon start up with your MFC?
If so, just click to a different preset, then switch back, and the expression pedals should work as normal without you having to fool with calibration.
(There may be a minor MFC bug and if so it will be fixed soon, but that is the super easy workaround).
Same here, but there was a difference between 9 and 10.
In 9, the expression pedal that I had plugged into EP1 when I powered up was all the way up. Then before I turned on the power amp I would rock the pedal leaving it all the way off. I
In 10, when I power up, it does nothing until I do what you suggest switching between presets.
So I am using the MFC-101, but it is acting differently depending on the AXE FX II Firmware.