Display resolution problem when login

My screen dislay suddenly has resloution issue. l checked System Preference -> Display
and the resolution is set at 1280x800, which should be the correct settings. But the display still shows on lower resolution.
I reboot/shutdown, still the display is not display as 1280X800.
Then I logon with a different username, it works as normal.
Only time the display has issue is when I am using my username.
It is a MacBook Pro running OS X 10.7
Anyone running into similar problem? Please help.

Reset PRAM.  http://support.apple.com/kb/PH4405
Best.

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