An update rollup for Windows Vista Media Center users has been released. It fixes a couple issues affecting the Vista Home Premium and Vista Ultimate platforms, both x86 and x64. These include:

• Windows Media Center does not correctly configure a combo TV tuner that supports both ATSC and NTSC signals on a Windows Vista-based computer (KB929011)
• When you resize the Windows Media Center window in Windows Vista, video playback may stop (KB932753)
• You cannot hear the audio in Live TV or on a DVD in Windows Media Center after you wake a computer that is running Windows Vista Home Premium or Windows Vista Ultimate (KB931967)
• Several fixes for the Media Center Extensibility Platform
• An update to the Digital Cable Card component to provide better support for interaction between the digital cable tuner, the CableCARD, and Media Center

The knowledge base article for the update is here, and the download is here.