Two new Xbox Live error codes have been popping up lately, going by the catchy names "801540B7" and "80070571." They reportedly prevent users from downloading their profiles and, as a result, keeps them from accessing the network and downloading purchased content. While it's not certain that they're tied to the recent dashboard update, the issues seem to have appeared after it was released.
Microsoft is apparently aware of the issue and working on a fix, though no ETA has been offered.
"We have recently identified an Xbox Live profile data error that results in Error Code '801540B7' for a small number of Xbox Live members," Microsoft told Joystiq. "The error instructs users to attempt to re-download their Xbox Live profile and directs them to customer service support for further assistance. We apologize for the inconvenience this has caused to our loyal Xbox Live members and are working to resolve the issue as soon as possible."