I have links to articles in the footer (the usual terms of use, about us, contact, etc). One of the articles brings up an internal server error. Only one of them though. Everything else on the site works, including jomsocial, kunena, hwdvideoshare and everything else. So far I have not found one broken link (though some generate unwanted strings, which I will edit out later), with the exception of that one broken article link. It doesn't matter where it links from either, the most read articles module when published includes a link to it, and it is broken as well.
This is my first experience with JoomSEF, as the internal Joomla sef has usually met my needs with other projects, so I'm not sure what is causing this problem. I know that I have configured my .htaccess file correctly, as everything else is working fine.
What could be causing this problem?