Problem of "Mac OS applications didn't remember your password anymore"a

After upgrading to Mountain Lion, I encountered a problem that every applications those requires user to login couldn't remember the password I entered, selecting "Remember me" or "Automatically login" is not working.

I installed my Mac OS X via clean install, I didn't why I encountered this problem, maybe it caused by existing two version of Mac OS X in my Macbook.

At first, I tried to delete all keychains in the login keychain, so I opened "Keychain Access", and switched to "Login keychain", selected and ready to delete all the items in login keychain, but failed.

it seems like the keychain items have the wrong keychain format, so we need to delete keychain items manually.

the keychain files is located at ~/Library/Keychains

Just follow the instructions:

1. open your terminal
2. cd ~/Library/Keychains
3. rm login.keychain
4. randomly open a program which require login to use like Evernote, logout and login, you will see the request to "reset login keychain to default", select "Yes", now everything about password storage will work like a charm.

Cool.