like some other person also said after 1.4.1 version there is a bug with paymentid.worker/pass syntax .
/* Address of you wallet */
"wallet" : "ExchangeXmrDepositwalletadress.PaymentID.workername/nanopoolpasswordforjsonsettings",
The above configuration is working with version 1.3.1..No problem.
But same config.txt file with same start.bat file in version 1.4.1 (just working start.bat and working config.txt is copied to 1.4.1 folder)..--> NO HASH on nanopool (today I left opened 6 hours and mined for nothing, shares found in srbminer but , hash on nanopool and balance 0 = zero ! )