mixer area at the bottom of the screen.All audio waves showing INF while the slider bar is and no sound comes out. Songs have been perfect before. Load it and all of the wave files have the word INF in red at the top of the slider. Ruined two songs now.
sounds like an audio issue, or rewire. Check nothing else has exclusive access to your soundcard, e.g. ASIO4ALL, and that you don't have multiple DAWs open... or even multiple instances of Acid open.
maybe you've rebooted since you posted this and it works okay now?