This may help you work out what is going wrong with local keychains in Sierra. Another free tool to spare you from Terminal.
Here’s a new version of this utility to check whether SIP and other security systems are active.
Introducing a revised version of my free Console replacement app LogLogger. This is now signed, with no other changes.
Is your Mac properly locked down with Apple’s security protection systems? Here’s a free tool to check most of them out.
Start up in Safe mode, and it’s stable; restart in ordinary mode, and your Mac is in trouble. How to identify and fix the problem.
Coupled with FileVault’s whole disk encryption, this can stop others from accessing your data. But there are disadvantages too.
All the useful key combinations, arranged by function rather than keys.
Enjoy being a computer owner-user-maintainer while you can: those days are NUMbered.
How to run individual components from sysdiagnose.
Looking in greater detail at what you can get from running sysdiagnose.