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2 comments

  1. This could be down to a number of reasons:

    a) The browser you’re having problems with is saving the old password and refusing access. This is why the other browser works when logging in with the new password. Try and reset the saved password to see if this solves the issue.

    b) Your hosting provider has implemented an extra layer of security to avoid WordPress websites being hacked. Contact your host for more information.

    You may also want to consider reading the following article: http://codex.wordpress.org/Login_Trouble

    I would have suggested this in the comments, but I don’t have a high enough reputation.

    Hope this helps 🙂