My b2evolution Version: 3.3.3

Greetings,

I just completed an upgrade from 2.4.5 to 3.3.3 and now when I try to delete a category from within the admin, I click the Red X and get sent to this link:

http://admin.php/?blog=2&ctrl=chapters&cat_ID=10&action=delete

Somehow my domain url got replaced with admin.php

Any help would be appreciated

Regards,
Alex