How do I allow registered and logged in Membership subscribers to access unprotected content?

Hi there,

I am experiencing a problem with logged in Membership users who receive a 'blocked content' message when trying to access unprotected content.

The only filter I am using is URL Groups.
Visitors are blocked from the following:
http://nikkibush.com/program/welcome/
http://nikkibush.com/program/account/
http://nikkibush.com/program/subscriptions/
http://nikkibush.com/modules/.+

I have added a Positive Rule for Members with the same URL group as listed above.
However, while they're logged in and they try to access, for example, http://nikkibush.com/books/, they receive the 'blocked content' message. When I test this URL in the Test URL Group function, for all I receive the message 'Invalid', which I guess is correct.

Strip query strings from URL = No
Regular Expression = Yes

I am using Membership 3.4.6 and Wordpress 3.6.1 - I believe both are the latest.

What else could be wrong?

Many thanks
Michael