Stupid question but do you have a sub? I didn't see it listed. If you don't have a sub there is no impact.

Darth is partially correct you can have -15db sub trim (that is the lowest setting) without problem. The bug kicks in if you add in a 2-channel sub offset and the total trim is less then -15db. For instance you have a 2 channel offset of -2db and you change you sub trim from -13db to -14db the bug kicks in. The work around is simple turn down the sub amp gain so the trim attenuation is not near the max attenuation (-15db).