Man, this one was driving me crazy for a few hours… I was having the same problem. Problem is now solved.
Where was the <div id=”lipsum”> coming from? I searched through all the WP source code… nothing.
Then I remembered where my content was coming from:
http://www.lipsum.com/
When the Lipsum site generates lorem ipsum text, it wraps that generated text in a div… a div titled “lipsum”.
So there you go… you must have been pasting your content straight from a Lipsum generator (or something similar), and your browser was smart enough to retain that div information on paste into your WP admin.
Hopefully this clears things up for you as it did for me.
