Unable to log on as Admin after Upgrade

Unable to log on as Admin after Upgrade

I just updated from Version 719 to 722 and then to 750 and applied Hotfix 751. Users can still login, but I can not login as Admin anymore. I did choose local Authentication, but it still wont let me in "Username or Password is incorrect" I logged in as a technician who has got Admin rights as well, and changed the password. Still no luck. Please help urgently,

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