Unfortunately, this is expected behavior with Transport Stream playback within the Media Center 2005 interface. Windows Media Player 10 will use the NVIDIA HDTVDemux filter to seamlessly play transport streams. Media Center Edition 2005 does not perform this function well as of yet. NVIDIA only claims basic transport stream playback support within Windows Media Player 10. Possibly, after future updates to Media Center Edition 2005 it will be able to play transport streams without this issue.