Youtube has broken 4KVD again

Files successfully DL'd just yesterday using 4k v3.1.2.1275 won't DL today using either that version, or the new
v3.2.0.1300. I either get a "can't parse link" error msg, or just a "!" in a yellow circle icon in 4K's DL list.

FWIW, both VideoDownloadHelper and 1-Click YouTube Downloader Firefox add-ons fail, but both of them have
been broken for weeks (or months).

Measures and countermeasures ... SIGH ...!!!