Hi Tushar
As far as I remember I had a similar problem and in my case it was due to specific font used in report definition. I did like this: first I checked if the problem persists if I use very simple report and it revealed that the problem was gone; then I started to remove parts of my report and checked if the problem shows up again. After some time I found out that one of the font was responsible - I don't know why.
Kind regards,
Radek