Yesterday Microsoft started rolling out a system update for the Xbox 360. The mandatory update fixes some issues with Xbox SmartGlass around playlist names and fixes an error with Xbox Music.
Details from Majonnelson.com
I wanted to let you know that the team has just released a system update for the Xbox 360 over Xbox LIVE. Starting today when you sign in to Xbox LIVE you’ll receive a prompt to accept this mandatory update. If you are signed into LIVE already, you may be signed out and asked to accept the update and you’ll be back online in a few moments.
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.