I'm having a very weird issue, this just popped up out of nowhere, now I cannot fix this problem. I tried to launch Keychain Access.app and I cannot seem to unluck my login keychain... it says (read only). I'm not sure if this is a bug in beta 5 of macOS Sierra or what. Sigh. I tried to log out of my iCloud account in system preferences , and now I cannot log back in because it keeps popping up a window saying 'Keychain login cannot be found to store "7879348" and it gives me an option to Reset to Defaults. So I try that and it keeps saying keychain login cannot be found to store email@example.com, it's like an endless loop that takes me nowhere and I cannot seem to fix this issue. Anyone know how to fix this or know why it's happening?