[Lan/Server] Can't open to lan using hamachi anymore.

I've played minecraft online with hamachi since " open to lan " function came. In older versions (1.7.2; 1.6.4... etc. ) I always deactivate my first network adapter then I click "open to lan" and voila! the game is hosted in my hamachi ip and people on my hamachi group can go in.

This started after 1.7.2. But since I updated my minecraft for the new versions, I can't do it anymore, people that try to go into my "lan server" receive a lot of errors like " java.net.connectexception connection refused no further information " or " invalid session "; " timed out " etc.

I just want to play with my friends. Is that a bad thing?