Since my update to ML 10.8 and Safari 6.0, all my websites with stored passwords don't get their username / password fields populated.
My settings seem to be correct, with the checkbox checked in Preferences to fill the password fields automatically, and I see my usernames / passwords in the Password tab for the websites.
I also reinitialized Safari, except for clearing out the passwords (because I want to keep them, of course), but still no success
Any idea what's going on in Safari 6?
Well, everyone following this thread should be happy to know that this is fixed in Safari 7! Actually, Apple has done something quite interesting: they've added an extra security layer that forces you to check a box if you want to bypass the "do not Autofill" requests from web sites.
This option is located under Preferences --> Passwords.
So, simply check this box and Safari pretty much saves every password you want.