Hi Bharath,
Well, they've forwarded my case to FPU for additional verification. I was also like you and came to India for a vacation and since my visa was expiring and also I changed my employer, i applied for visa stamping when i came here. Unfortunately, I got stuck here coz of the aforementioned reason. Its true that 8 outta 10 cases get through without any probs, but if you happen to be in those 2 guys, you'll have problems and if you are willing to take your chances, try it out. otherwise, i'd advice you to get it stamped in St. Louis.
Good luck
venky