While playing around with the wallet I have tried to dump a private key and then to add it to a wallet with the command importprivkey in the console, but it doesn't work - I always get a "Invalid private key (code -5)" mistake. Or otherwise "Method not found (code -32601)". This is not very reassuring. Is it a bug of the wallet? Otherwise which could be the problem? I'm using PRiVCY v. 1.2.1.0