Ok, i think i've resolved my problem. In my lan networks there were 2 Hamachi network interfaces, both of them connected, so i suppose that Hamachi program did use the wrong one. Now i've deleted those icons, reinstalled Hamachi and now there is only one icon.

Well, if anybody wants to play online now, i'm available at Maions network (Greek EB, password: eb): i would really like to try if it works now.