I upgraded an installation to 5.6.1.1 yesterday and everything was fine while I was working on it. But today, when trying to log in again I get a username/password invalid message and the page also says "You are not authorized to access this page".

So I returned to the /dashboard/ and used the forgotten password link but when I get to the change_password page, I get the same "You are not authorized to access this page" message.

So where do I go from here?