Support got back to me; somehow the sorting went pair-shaped, and it is fixed....

Found a mention that this indicated we have exceeded our quota.
But I've checked and we are at ~50%.

So there's an Album: Emailed Photos.

On the Photos index page, I see one & "556 photos" but when I go into the album, it's empty.

The zipper says 1 - 20 of 556 and the usual 1234...
but all the images are {drum roll} invisible.

It wasn't this way before.