You're not alone. I've the same issue. Using IE as well as Opera on Windows 7. I logged in with facebook integration and removed facebook integration, added it again, deleted the cache, used the private mode as well as the normal mode.. no luck..
It saves the settings here, too so the error is just a cosmetic issue..[/edit]
People who were trying the welcome block on xenfans were reporting this as well. The matter seems to have gone away when I removed <label> around my own link. That of course could also have been a coincidence.