If you, like me, use a bunch of Machine Custom Fields, you might find that some Views aren't working particularly well after you import them to a new server that may or may not have the same Machine Custom Fields (or had them added in a different order).  You'll likely find that the "Advanced agent data filter" is showing several MCFs as "undefined" like below:

**Assuming that you're on-prem**, you can run the following SQL query to identify which named Views have fields that are undefined:

SELECT DISTINCT v.viewName FROM viewDef AS v
JOIN reportFilters AS f ON f.filterId = v.advFilterId
WHERE f.filter = 'undefined'

It should then be easy to find/fix said Views without having to check through *all* views for this issue