When you login as a local user, even as local admin, the UI is showing blank screen in various components such as Dashboard, Inventory, Report, and View
Aria Operations 8.18
This is a known issue on the Aria Operations 8.18 GA release.
The fix has been applied on the Aria Operations 8.18 Hot Fix 2 release.
Upgrade to the latest Aria Operations 8.18.3 release to resolve the blank UI issue.