DatePicker suddenly doesn't work in Preview mode but does work when Published.
I create a blank page, add a DatePicker, clicked Preview and
No date appears in the DatePicker's placeholder area (the setting is set to today's date)
The DatePickers dropdown calendar doesn't appear
When I publish it, the published version works fine.
No code has been changed in this area.
I've confirmed that the DatePicker.value property is properly set to the correct date by dumping it to the console.