I added a NAS entry which, apparently, is bad.
As a result, the Library, Playback, Network and System tabs in the UI do not load. They just load continuously, but do not fail. The Main and Credits tabs load. The Library link on the Playback tab load forever too. But, I can use the Playback and Main tabs to otherwise control music streaming.
I can also SSH to the device, and I can connect via Windows and view files in the device, and I can upload and manipulate files.
Where do I remove the NAS entry that seems to have fouled up the parts mentioned above?