Found It !!!!
V's post's code starts with the HTML tag for a non breaking space. Just added it to my testing post, which was fine before. But that addition resulted in the DBE. The tag is (but no spaces between characters):
& n b s p ;
I can edit that out and see what happens to V's post on MotM. But I'd prefer he do it and see what happens. (although I can as moderator, I don't like editing other's posts. I cannot edit comments.)