This issue with the SubSpace’s navigation bar is caused by a problem with the search functionality of Confluence. The affected user is not able to search for any content in the Confluence (spaces or pages). When the SubSpace’s navigation bar tries to load the configuration, which is saved in a page, the result of the search will be empty. As a result, the navigation bar does not have any data to use in order to create the view.
Cannot search for page even though it exists
Diagnosing the issue
In order to check if search is working for the affected user, try to search for some content in Confluence. Try searching for any page or space as long as it is not in the recently visited list. If the page is in the recently visited list, it will be shown as a search result, even though the search is not actually doing anything.
Search not working, shows only the recently visited page
One other test that can be done is to compare the search result of the affected user with the search result of another user which is not affected. The not affected user will be able to see the SubSpace’s navigation bar. The result of the search should be very different between the two users. The two images below show an example of the difference between the same search done by two users with identical permissions.
Search result of the affected user
Search result of the not affected user
The only solution for this issue is to contact the Atlassian support team. To do so follow the steps below: