Having an issue saving ads with new version

[Brewster]

Hi

I have upgraded to the new version on my forum but am having an issue saving the ads. I get the following error:

Forbidden

You don't have permission to access /index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I get this when trying to change existing custom ads to banner ads

Joe

[SMFHacks]

Ask your host to disable mod_security for your site.

More details: http://wiki.simplemachines.org/smf/Mod_security_-_Having_problems_with_mod_security