In Drupal 7 some menu items, even though they exist in menu_links db table, do not appear in the menu. I wonder if it has something to do with cache, but I have disabled the cache and cleared it.
If I add a menu item that goes for instance to
<front>, it appears in the menu, but if I add a menu item for a certain node, it does not appear. I can't find the logical reason for it.