Do you have streaming content in your library, or only local content?
Our diagnostics indicate that your library currently has 0 tracks.
I’d first verify that your Watched Folder locations are active and visible to RoonServer. Then, make sure in Settings → Services that any streaming accounts are signed in. Force a manual sync.
If playlists are only missing in Album view, and not the sidebar, then check Settings → General to make sure Playlist Visibility is toggled “On.”
Did you recently migrate to this Innuous machine from another RoonServer?