iOS 6.0.2 introduce password bug?

Since I updated to iOS 6.0.2, I've experienced problems with some apps that can't seem to remember password credentials after each reload. I have to RE-ENTER the login credentials repeatedly. What a pain!

iOS just can't seem to remember Twitter password in the Settings!! I entered Twitter password, iOS then verify it is correct. Then when I return to the Twitter setting, iOS IMMEDIATELY forgets the password.

Another website reported this problem in greater detailhttp://estrategypro.com/discover-which-ios-apps-store-password-securely-with-ios -6-02-bug/

There could be a bug in the iOS keychain in 6.0.2. This looks serious to me because it has security implications.

Anyone has the same symptoms?