Hi Aamir,
Ok, so you are making the change to the form on the background, and are logging into the web interface on the background to test it?? Just want to confirm that. If yes, then it could be what I mentioned about the form groups. You may be using a role that has a form group other than the one for which you updated the form, thus you wont see the updated form as its not part of your form group.
Additionally, can you confirm if you made the change to the form directly or if you used web screen painter?
Once you saved the form, where did you save it specifically?
Thanks.
Jon I.