When I started my "El Capitan" partition today, I was requested to change the password on my Apple ID since it seemed to have expired.
So I did and the next thing that happened was that I was told there was no access to iCloud so I pressed the button "iCloud settings".
System settings showed up ("Systemeinstellungen" as I use a german localisation, was it "preferences" in english?) and a spinning wheel occured... That was the last thing to happen.
Same result, if I choose "iCloud" from the system settings directly. Spinning wheel, no dialog. Did not try to change the settings before, so I can't say if changing the password was actually the cause.
Anybody run into this also?
How can I post a bug report about that situation?
(Needless to say that I cannot use the CloudKit samples any more).
Regards
Ulli
Many people had this same issue. I solved it by deleting all files from the following folder:
/Users/<YOUR HOME FOLDER>/Library/Application Support/iCloud/Accounts
Then reboot.
I was then able to get into the iCloud preference pane, where it asked me for my new password. After giving it, all was working again.