So, just to restate; you've tried opening the table in Design View and add the Default and you've tried adding the Default in the form Design View thru the Properties sheet? And when you add a new record there is no Default?
First off, you do know that the new Default will only affect new records, right? Old records with no value won't have the Default entered.
Ther are reports of other Properties not being retained in Access 2007 unless you enter them, click on another property, then exit. I've seen no report of this happening with Default Values, but it might be worth trying.
Linq ;0)>