when navigating hd menus, as the video window "flickers" during a transition, i hear a loud pop or crackle when the video window reappears, or during a gui to full video transition. that's the only time there's any sound issue. with the video menu disabled, there's no popping. i can end the popping by disabeling, then enabeling, the video window, but the popping always returns. my video is high speed hdmi, my audio is optical cable, sony home theater receiver, tivo premiere xl. any suggestions? i think this may be hd gui related, or sony optical related (based on the other forum posts).