Wow - I thought I had just bought a bum TivoHD box! Glad to know I'm not alone. I'm having this issue with a Sharp Aquos hooked up via HDMI and a Tivo wireless adapter. It sounds like I can swap off the HDMI to component and optical audio and be OK? I have a Tivo HD in my basement home theater hooked up this way and have no audio problems at all with Netflix.