Technical issues with Heroes III.

Has anyone else had a red circle next to the network name in Hamachi? I reinstalled it (including initially installing it in the wrong directory due to carelessness), and now half of the networks are like this, and I can't join them. I restored a backup (the Hamachi folder), but it didn't help. I leave the network and try to join again, and it says that the network might be full. And my second question is: where does Hamachi store its settings? The registry only shows the default directory.