A new system update for the Xbox 360 will be going out over Xbox LIVE today.
The next time you sign into Xbox LIVE you will be prompted to accept the mandatory update. According to Major Nelson, the update “fixes a few things.”
“In this update, we are correcting some issues such as displaying the incorrect playlist name when launching a playlist from Xbox SmartGlass to the console, an error with Xbox Video closed-captioning and an error with Xbox Music that some were experiencing.”
Source: Major Nelson