Hi Diptesh,
If you open it in the WebI Java Applet instead (via BILaunchPad) does it work?
What's your data source? (OLAP, relational?)
In KBA 1766134, I see a similar issue was reported for WebI Rich Client that was corrected in earlier versions that what you are running. I wonder if there is a lingering defect for the over-the-web viewer/editor.
I would recommend that you open an incident with support for this one for further investigation.
I hope that helps!
Carly