Watching Live TV, I get no sync problems with local channels, or other channels like the History Channel. However, as soon as I try watching HBO I get audio sync problems. I can hear the "clicking" of the audio as it trys to correct the sync, but the sync goes in and out as the movie plays. I am using a Hauppauge 350 and a digital cable box with a Hercules Fortissimo sound card. Audio is connected directly into the Hauppauge. Seems like it is related directly to watching the HBO channel???