Next question: I get an Invalid Page error when I click on my Cases tab (in the community logged in as a community user). I figured out that it had to do with the visibility of the default list view. If I set the defaulted list view (which is a custom list view I created) to be visible to all users, it works fine. But if I set it to be only visible to the group "All Customer Portal Users", then I get the Invalid Page error. Same thing happens when I do this on the Accounts tab and other Salesforce object tabs. 

Do I need to configure which users are in the "All Customer Portal Users" group? If so, how do I do that?