Desktop Central - Inventory Page - "Summary generation in progress ..." is stuck until I restart the DC Service.

Desktop Central - Inventory Page - "Summary generation in progress ..." is stuck until I restart the DC Service.

When I click on "Generate Summary", it gets stuck at "Summary generation in progress" until I restart the DC Service.  This can happen for days until I manually restart the service.
              New to ADManager Plus?

                New to ADSelfService Plus?