Hello all concerned,
I have finally been able to solve the problem. The trick mentioned by "Mr. Dhirajlal Rambhia ji" worked. I could not download the pre-filled data from the portal for the last two days because the portal had been down. What I did to-day is that
1. I uninstalled the utility and again installed it.
2. Imported my saved .json file into the utility and started verifying the data afresh.
3. All my previously filled data was available. I only verified the same without much correction and confirmed all schedules.
4. Everything went smoothly and I was able to validate my return (ITR 3) without any error message.The return, however, could not be verified & uploaded as the portal is still down. The Preview has been downloaded successfully and it appears to be in order.
5. I had worked with the utility 1.0.9 in offline mode although the utility remained connected online all the time.
I hope my experience may be useful for others facing the same problem specially "Mr. Sudhir Trikha ji"