The problem is gone, apparently. But some of the hardship in formatting headings etc. remains, as reported Dec 18, 2012, 3:34 PM.
I noticed couple of days ago WordPress has a new (?) policy of replacing unwanted URLs with a link to a note about a policy regarding advertising sites. Has monkeying around with this new thing caused the problem?
WordPress monkeys should give us a direct answer, but I do not see any facility to contact them directly.
I have since cleaned up the example that I gave, so it is not a good (sic) example anymore.