How to Deal With Registered Users that DON'T Buy a Subscription?

I'm assuming I'm missing a setting or step somewhere. If a user registers but DOES NOT purchase a subscription (I'm only offering one level) -- I want them to be treated like a visitor and be allowed to view all content except the protected content. Right now -- a registered user that hasn't subscribed gets bounced to the Protected Content error page when ANY page is accessed. How do I got about dealing with these users? Keep in mind that I don't want them to access the protected content until they subscribe -- obviously. Thank you for your help.