Suddenly the Tag Sources/Cover Art server seem to be throwing back errors to MP3TAG.
The Amazon servers seem to be throwing back "400: Bad Request" errors for everything (including searches that I know worked only about 6 hours ago).
Maybe another attempt by Amazon to stop non-browser clients from accessing anything on their servers perhaps? As I know how stupidly "protective" their policies are.
Discogs shows "401: UNAUTHORIZED", but I know this has always been flakey at best.
MusicBrainz is actually working (mostly).