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^^ In case that doesn't work.

I had this problem a few weeks ago and it was maddening. I uninstalled, reinstalled, reinstalled UO.. what ended up working was installing an older version of CentrED. After I tried logging in with the old version, I was able to log in with the latest version.

edit: Back when this happened I read about it possibly being due to CentrED being blocked by my firewall but this was not the case.