A family of Microsoft word processing software products for creating web, email, and print documents.
Oh, it was definitely corruption, but there were dozens of paragraphs affected, so I doubt that copying and pasting everything but the final paragraph mark would have worked.
I isolated the problem in the body style. It was a ghost--not an intentional setting. So I opened up a new document, made a new body style, identical in all intentional respects to the original (though with a new name), moved that style over to the destination document, then searched and replaced all of the old body style with the new. Voila! :)