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Logout, Switch User, Shutdown etc has stopped working in one of the accounts on my PC

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http://askubuntu.com – It is really very strange. On my PC running UBUNTU 12.04 LTS is behaving strange since past 15 days. If I click any of these Logout, Switch User, Shutdown, Restart etc from one user account which has got administrative rights, UBUNTU tottally Freezes and then only way out is hard-reboot by pressing power button on the box. Yes, but If do SUDO SHUTDOWN from terminal, it works fine. from the other normal user accounts all of above works fine. Please guide me (HowTos)