SCOM web console - Performance View Time Range

Hi, 

I am trying to change the default time range from 24hrs to 48hrs. I have searched for solution, however, all of them are same as this, and it didn't work for me.

http://social.technet.microsoft.com/Forums/systemcenter/en-US/bae50efb-7de3-4e60-bb07-13019fb3f432/web-console-performance-view?forum=operationsmanagergeneral

Has this solution worked for anyone using SCOM 2012 SP1? I made the change to 48hrs, after a iisreset, it is still showing 24hrs.

Any ideas?

Thanks.