see known bug ITSI-20605
Check the roles: are all the users impacted or are only non-admin roles impacted?
Check the web_service.log in index=_internal, do you see errors like that or different views or management views.
An unknown view name "homeview" is referenced in the navigation definition for "itsi".
Check the app metadata permissions for those views.
Example: in ../etc/apps/itsi/metadata/local.meta, look for the view "homeview"
Check which roles have read and write permissions, If only the admin can, there it's the root cause.
Compare to the default permissions in ../etc/apps/itsi/metadata/default.meta
A corrupted permissions stanza will look like that, you see no roles in the brackets :
access = delete : [ ], read : [ ], write : [ ]
Resolution
Clean the .../etc/apps/itsi/metadata/local.meta
Removed all stanzas impacted, as they were conflicting with the definition is default.meta
If the instance is a Search-head cluster, you will have to fix is on all Search Head, and restart.
