Date Picker <Select a value> doesn't display any of my date fields
The Qlik Sense Custom object named Date Picker usually works well in most of my apps. I have a newly created app with several date fields and I've inserted the `Date Picker` filter into my app.
For some reason, there are zero fields available in the `Date Picker` filter object. The only selection is <Select a value> and there are no fields to select! In my load script I'm loading the date as `Date(StartDate, 'DD-MMM-YYYY') as StartDate` which usually works fine. I've also tried the generic `Date(StartDate) as StartDate` in my load script, the StartDate shows up in my tables and visualizations, but not in the Date Picker custom object.