You shouldn't mix formfields and content controls in the same form. Since you're using a datepicker content control, you should use either plain text or rich text content controls instead of text formfields. With content controls, you also don't need to apply the forms restrictions applicable to formfields; rather you can use the editing restrictions, with the content controls marked as exceptions. You can't mark content controls as excptions if using forms protection.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]