Blogger is Insufficient
Update (clearly, that was not all!):
My apologies for the multiple posts expressing hatred for Blogger, although, I should make clear, my hatred is not abated. There is something about not being able to view one's own sites that makes disappearing posts seem unreal; hence the multiplicity of posts about Blogger's insufficiency. My thanks to those here and at HatingonCharlesBird who suggested Wordpress. I'll look into it.
Blogger seems to have restored operations to normal, for now. For what that's worth.