A couple things to check. First, make sure that studioone.exe is added to the exceptions in your firewall on the pc. Then go in to preferences in S1, I believe under general, and there is a tab for networking, Make sure the box is checked to allow discovery over the network.
When installing S1, there is a firewall message that comes up asking to allow network connectivity. I know I used to not allow because I had no need for it. Now with the ipad app and capture, those descision are causing problems with connectivity