Ho lo stesso problema. Quando creo una categoria ricevo questo errore 410: 

Gone

The requested resource
/admin123/index.php
is no longer available on this server and there is no forwarding address. Please remove all references to this resource.

Additionally, a 410 Gone error was encountered while trying to use an ErrorDocument to handle the request.

Qualcuno è riuscito a risolvere in qualche modo?