There have been examples in the SAFE system where a saved query in the Widget window is showing a result of 0 items but if you click on the 0, it brings up the query with correct results.
This example is showing that I have a saved query called 'Impound Lot' and it shows 0 as a result.
However, if you click on the 0 (to see the actual results) it shows the correct results as you would expect.
Problem: If this occurs, there is a malformed saved query in the background. Most likely the saved query was built from another and the system overlapped some of the background query information.
Resolution: You must remove the widget line item and the saved query then rebuild.
This should fix the issue.