Ok, thanks. BTW, I can see my imported watch only address on the bitcoin-core-qt, but when I search THE SAME address on blockchain.info, i get an "Unrecognized search pattern" message. Why? Is that a bug in blockchain.info? Please explain...
Not entirely sure, but its also not uncommon for blockchain.info to have issues. There are other blockchain explorers you might want to consult -> https://en.bitcoin.it/wiki/Category:Block_chain_browsers
As long as the address starts with a 1 or 3 and has 26-35 base58[1] symbols it is most likely correct though.
[1] https://en.bitcoin.it/wiki/Base58Check_encoding#Base58_symbol_chart