This article describes how to change permissions across multiple Web Content Display Portlets at the same time.
If a template is created that contains multiple Web Content Display portlets, they are not visible by default to the Guest user of the website. If you try to access it you will receive a, You do not have the roles required to access this portlet, error on anything added by the Page Template. You can manually log in as an admin, and change permissions for each individual portlet, but to save time there is another method.
To change the permission for all of the Web Content Display Portlets:
Navigate to Roles -> Guest -> Define Permissions
From the drop-down menu select Web Content Display, which is under the category of Site Applications.
On that page check View. This enables the Guest user to view all Web Content Display Portlets.