I am having an issue showing adsense on my front page, and I can replicate this under certain conditions. The ads aren't showing properly on the front page of my site only - the sidebar 300x250 ad doesn't show at all (only white space shows), and the top header is a PSA ad. The ads are working fine on other pages within the site.
I think I have narrowed the cause of this problem. I think it has something to do with either the .htaccess or the index.php, and possibly the permalinks. For example, when permalinks are set as numbers, I get this error on some of the other pages on the site. Also, right now I have my wordpress installed in the root directory of my site, but earlier when I had it i installed in domain.com/wordpress/ it worked fine, until I set Blog Adress to domain.com, at which point the problem appeared.
Just for the record, I am using the latest version of WordPress, and every other part of the theme/wordpress seems to work. If anyone wants to take a look the site is up at bookfail.com.
I'm hoping someone out there knows anything about this issue. Thanks.