For websites hosted with Dreamhost, you have an analytics page by default at yoursite.tld/stats/. WordPress can interfere with this, thinking that you are trying to link to a page or category and give you a generated 404 page instead.

Simply add this to your .htaccess file ABOVE the typical # BEGIN WordPress stuff to get it working again.

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^/(stats|failed_auth.html).*$ [NC]
RewriteRule . - [L]
</IfModule>