Login keychain disappears on login Running 10.8.2 on MacBook Pro, sometime after upgrading to Mountain Lion 10.8.1 I started getting the message box that passwords, etc. could not be saved to keychain.  I did the usual (repair permissions, repair keychain).  It would make a new login keychain which is usually fine until I reboot my system (but not always) and then the login keychain disappears again.  Any suggestions?
Try running repair permissions from the recovery partition so the keychain isn't in use and can properly be repaired.