[ubuntu] Ubuntu software center not working

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http://ubuntuforums.org – Everytime i launch the sw center it opens up for abt 2 minutes,then becomes black,i had recently changed the source of the download for the center from "server India",to the best available,the problem started to occur after doing this,i have reinstalled the sw center package using synaptic,but the problem continues..i have tried Code: sudo apt-get install --reinstall software-center as well,i guess its the same,but no progress,pls help me out here guys,thanks..:),btw i am running ubuntu 12.04. (Hardware)