Title pretty much says it all. Previously had no problems connecting. Both Library Server and client are OS X 10.10.5.
Interesting thing is that the Remote Library server doesn’t appear in client at all, unless I toggle “Accept connections from remotes” on the Library server. When I do that, the Library “Connecting…” message appears briefly on the Choose Your Library page, but then the connection fails.
We didn’t make any changes related to discovery mechanism in build 94. Try to manually enter Library Server IP address - on ‘Choose your library’ screen press on ‘I want to connect to a different library’ and enter the IP.
If this won’t help try to restart both machines and your router.
You might also check that:
Both machines are in the same subnet
Software like firewalls or antiviruses (including the one which is built-in the OSX) don’t block Roon