UPDATE: It looks like I fixed the 404 problem. Please let me know if you encounter any broken links. And a tip for you WordPress Webmasters, when you set permissions for .htaccess, use octal 777 instead of 666. And back up your files before you change them. <facepalm/> Thanks to the posters on the WordPress.org forum for their help.
If you get a 404 error when clicking on a link, I am working on the problem and will have a fix soon. I’m sorry for the inconvenience.