'Forbidden' error when trying to add an item

Forbidden

You don't have permission to access /omeka/admin/items/add on this server.

I also can't access security settings.

Forbidden

You don't have permission to access /omeka/admin/security on this server.

I can add pages, collections, exhibits, and users, however.

I've checked directory permissions, looked over .htaccess and apache conf, but no luck. Any ideas?

SOLVED:

This ended up being a mod_security issue. I commented out the inclusion of the mod_security.conf file in httpd.conf and everything is working now.