Step 11 of the 'keychain access' instruction fails for me

As I have it, the options are "use defaults" / "always trust" / "never trust" -- so "no value specified" is not an option.

Also, it was not on "use system defaults" but on "always trust".

Any explanation?

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Upgrading this system to 10.9 (mavericks) creates severe trouble: before, non-working Appstore and iTunes Store was minor nuisance, now I cannot even install Java or do a security update! Very weird.

Revert to 10.7.5 from TimeMachine backup: problem as-is (no appstore, no itunes store, and certificates-complaints starting up itunes).

Clean install from a bootable USB stick: all goes well... Then use TimeMachine backup for transferring my data/apps/licences: appstore Kaput! itunes store Kaput! iBooks Kaput!