If you don’t see the Roon logo in the menu bar, Roon Server hasn’t launched in the background alongside the GUI (Roon). Your Remote has no server to connect to on the same machine.
Diagnostics indicate that you’re still running RoonServer build 1680, which had an issue affecting some Intel Macs. We have a hotfix (build 1683) that should resolve this problem:
Please try uninstalling and reinstalling Roon to update to the latest version.