Membership plugin - Access

Hi

I have built a site, where I use the membership plugin, with a negative set of rules.

I have used URL groups to protect pages. I have one level of membership that is not allowing the members to see some of the URL's. I have been in and re-added the URL to the URL groups and this has not changed the security on that page.

Can you suggest anything else to look for?

(My site is education.fastersocial.com)

Thanks

John