Privileges blocked to the Wiki?
Help Pop Out Menu example
When a Permission Set is set to "Deny" by default for "Menus & Pages / Urls", any User who uses that Permission Set will be denied access to search the Wiki. This can be easily corrected by adding Permissions to the Wiki Specific URLs.
Add the following Permission to the impacted Permission Sets:
Granting Permissions to the Wiki example
Page: Default
URL: wikihelp
Allow: yes
Once applied, these Users will be able to access the Wiki.