I have been using Adobe Premiere Pro in windows Vista. Suddenly today the sound has disappeared. I thought at first it was the new video clip I had imported, but when I tried a video I was editing only the other night, which was then working perfectly, I realised the sound had gone. My audio files play perfectly well in Media Player and other programs so there is no problem with my soundcard. Does anyone know what could be wrong? How can I get the sound to work again?