Hey there
I used the same passphrase for several transactions. I made a backup of the wallet then restored it on the new operating system and the passphrase now is incorrect. Have anybody any idea what this crap is about? It'd be much appreciated, I've already lost some bitcoins because of corrupted wallet (they are DOGE this time obviously).
I don't know what you mean paraphrase? Are you referring to the encrypted wallet password?
An easier way to do this is to dumpprivkey in the console. On the new machine, sync wallet then importprivkey in the console and you have your wallet.