I've recently installed Gravity Forms and am setting up my first form. One of the fields is a custom post field called 'Website'. On the front-end, when I go to submit a website using this field, I get instantly directed to a 403 Permission Denied page with:
Forbidden You don't have permission to access /add/ on this server.
(/add/ being the page where the form is)
I've narrowed down the problem to being the '/' character in the field (e.g. http://). How can I get around this?