Today reinstalled v 3.15, now its working fine. Backfilling is okay. Only problem now left, it is not working for realtime quotes, nor throwing any error.
Dont know, what I am missing. Can some one point towards it.
I think changing over to a new version, does not not need any changes in RTD configuration, setting etc. except change in Welcome XX (xx are words as per Nest), if there is any.
Someone, please suggest/point out the mistake/step, I am doing/missing.