after your site running for a period of time, you may find that anonymous cannot see new node and view content in drupal. you may check the permission setting but nothing wrong.

this can commonly happen if you install/ uninstall modules often, several modules such as Organic Groups can cause this problem.

do not pull your hair out or kill your site for a new one. only the permission need to be reset so that the drupal content can be viewed by anonymous. the default drupal core can't complete it. we can simply download some permission management modules such as Taxonomy_access to reset the permission. it works for several of my sites already.