Rizio Networking Solutions

Wondering if my situation is related. My customer and in house systems were updated to 10.28 over the past 24 hours and ALL scheduled and on demand Tasks fail with the error message "No Systems Found". I've had the same tags and scopes described for "years" and suddenly - tasks don't run. I've raised the issue with support but not heard back yet.
Do your tasks run at all ?

I've created a tag and applied it to some devices. In device list or device management, when I filter for such tag those devices are displayed.
Then I created a simple scope, based only on that tag. But when I list devices for that scope, the list is empty.
This happens also for default scopes, such as "All windows computers".