Hey, strange yours happened 2 years ago almost to the day! Is there some timing bug or something? LOL
Anyway, same thing happened to me.
My amp always worked fine, no problems, then today turned it on, hit the tuning to get everything just right, but when I returned to play my guitar it was only clean sound. All other effects disabled and not working.
Weird.
Tried uplugging for long time and restart but still nothing but clean sound. Reverb seems to work but no matter what I do clean sound only.
Anyone else have a solution?
And did your problem begin in February? :wacko: