I figured out that it has to do with a URL link that I am putting in there. When I copy and paste the web address and then use the URL function key to turn it into a link, it makes the entire header (text only) disappear. Of course, I could just forgo the link, but it still seems to be an issue.
I had the same problem a few days ago with a review. I fixed the problem by isolating the link from the main body text with a colon before the url.
Just wanted to add here that I really enjoy your geeklists. A new list from you is a "must read."