Verifica ca in htaccess sa ai regulile standard ale wordpress:

Cod:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Dupa cum spune si roby ar trebui ca redirectul sa functioneze automat.

Mai multe detalii legate de permalinks gasesti aici.