If you're using hamachi to host a LAN game, the recent change in hamachi may have affected you.
They now have a 2 in front of their assigned IPs (ie. 25.x.xxx.xxx)
I figured out a quick fix for connecting to a friend's LAN game, or having your friends connect to yours.
I have Windows7 OS.
Control Panel-> Network and Sharing Center -> Change Adapter Settings -> (Notice Hamchi is an 'unidentified network') Right click on Hamchi Network -> Properties -> Select Internet Protocol Version 4 ->Properties -> advanced -> Select gateway 5.0.0.1 and click edit -> change the Gateway to 25.0.0.1
I use Hamachi to play a LAN game of Minecraft. This problem just started today, but no one else has posted a fix, so I'm trying to get this one out there.
I hope this helps