“We have recently identified an Xbox Live profile data error that results in Error Code ‘801540B7’ for a small number of Xbox Live members. 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.”
While this doesn’t seem to be a widespread issue, it is pretty serious, so you can expect Microsoft to work hard and fast on a solution. Any of you experienced this problem since the Dashboard update?