"nothing playing" blinks

everything marvelous until last night, I’ve an external HD to the Pi running Volumio, Pi out to a DAC sounds great. I control from MPod or MPad from an iPad, but last night both just blink a message saying “nothing playing” and can’t add albums to play. Any ideas? I don’t really want to flash the card again but is it possible it’s corrupted? (Kingston 8gb HC)