Switching positive access level rules to negative protects all pages


I am trying to switch a group of positive access level rules to be all negative because I realized my blog posts were not being protected from a search. When I try to make a positive rules level that is already in user (ie has users attached to it)to all negatives rules, it ends up protecting the pages I have said I'd like shown. The menu system works properly and shows the right menu, but the pages will not display. Your help is much appreciated!