UPDATE: Time is running out here: any suggestions?
Was trying to update details on RaiderIO, and it kept warning of oauth errors, eventually pointing me to an article explaining how to disconnect / reconnect 3rd partys to Authorised Applications.
The Authorised Applications panel is the equivalent of the spinning beach ball, and it never loads. After a short amount of time, it times you out of your account settings altogether.
- All proforma account connections options - Apple etc. - are not connected.
- Parental controls are turned off
- I tried cycling: Update > Game Data And Profile Privacy > Share Game Data which said it might take 30 days…
Need it sorted to play a charity tourney on the weekend… 
Blizz support said have a look at the cookie cutter tech support self help page which, of course, is not helpful.