This is a common issue when a blogs rewrite rules have been altered. You will notice this when you are clicking links throughout the blog, and you get a '404' error.
The fix is as follows: Add this to the .htaccess file.
# BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule>
