Cant login after yum update in fc 11

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http://forums.fedoraforum.org – Hi everyone, I did a 'yum update' in fc11 and later I am not able to login. When I click on my user name, it says 'unable to authenticate user' without even entering any password. stuck with this problem for quite some time. I am a newbie to linux. Any help would be greatly appreciated :) (HowTos)