Missing items from Top Navigation Bar

For example, if I add Leads under the Configure Module Menu Filters to any menu, it simply doesn’t show up.

I already visited the “Display Modules and Subpanels” and enabled every single module to “Displayed Modules”. The admin panel doesn’t seem to be working here. Am I missing something, or do I need to manually edit files to fix this?

I’d really like to be able to enable Leads and other “stubborn” modules.

Are you sure your file permissions are set correctly?