Tags quit displaying

Since yesterday a refresh will read the correct directory with the correct number of MP3 files but when finished nothing displays in any column. The problem occurred at the end of a long session of manually updating tags to align details with playlists in Spotify. Nothing was synched or downloaded that I was aware of. V3.35.1 was installed this morning. Files, Apps and PC have been closed, reopened and rebooted. The files show tags in Windows and play with Media Player.

Do you have APE tags in the files? If so, please search the forum how to handle the display of ID3Vx and APE tags.
E.g. here:

Try pressing F3 (Filter / Toggle) and deactivate (or empty) it.

Thanks. It was actually the filter (f3).