As you've probably noticed, I'm using Google AdSense service to place ads on this blog.  Recently I decided to place a row of ads at the bottom of each post and some, but not all, of the ads on my home page disappeared.  Interestingly there were not any missing ads on other pages.  I also checked the AdSense Site Diagnostics and there were not any blocked URL's listed.  After a quick search of the AdSense Help I determined my home page was exceeding the maximum number of ads per page.  So, for now, I've removed the ads that were appended to the posts.