Same here with middle switch on my ModFactor. Tried various reinstalations and reinitialisations, nothing helped. I'm afraid it is a hardware problem, but I can't remember doing anything unusual that would cause it. My workaround, pretty compromising and unsatisfying, was to place my presets to 1:1, 2:1, 3:1… positions, so that I don't need to press middle switch at all. Since I live in a country that has no authorised Eventide dealer nor service, I just don't know what to do.