As some of you may know an Xbox Live Update as been released. The Changes include the HDMI audio problem some were having. Here is what Major Nelson said " Dashboard Update (aka the HDMI Audio fix) Starting Tuesday morning at 0200 Pacific when you sign into Xbox Live you’ll be prompted for a mandatory dashboard update. The update addresses the issue that a few folks were having with audio and their HDMI connection. This update will be rolled out to all Xbox LIVE members around the world over the space of a few hours, so you may not get prompted for the update immediately. Thanks for your patience." Source