I've started the game since about ten minutes when the pg freezed. He doesn't move anymore, the interface works "graphically" but the result of writing or click the button are... nothing. So I've close the game, and now the game say to me "Could not connect to server".
The firewall is windows firewall running on Vista x32 and java is enabled, my IP use a NAT so I'm ever in NAT. I tried with Firefox and with Chrome, all at the newest version (even Java).
Is just a server's problem?