macOS 10.12.6 Sierra keychain has stopped saving passwords, how to repair?
Warning: macOS no longer supports Keychain repair, instead it just creates a new default Keychain, which will result in a loss of all saved passwords.



Quit all open applications that might be using Keychain including Sequel.
To try to repair the Keychain use Finder to go to /Applications/Utilities.


You can also CommandShiftU from Finder to open that folder directly.


Launch Keychain Access.
Then go to the menu bar and select Keychain Access > Preferences.
Click "Reset My Default Keychain"


Follow any instructions beyond this and retest those applications.