There was an error in Apple ID Preferences
'There was an error in Apple ID Preferences' and 'Update Apple ID Settings - Some account services will not be available until you sign in again' seem to be perennial problems that no obvious answer has been posted to. It's happening on my 13"MBP.
I also can't Sign Out, as that is greyed out and not able to be selected. I've done the re-boots, plists and a bunch of stuff which clearly does;t work. Anyone had any joy in sorting this out????
MacBook Pro Retina