The choice of Sections only appears in a document that has Section breaks, thus creating multiple Sections, and exists to allow the user to leave the unchecked Sections unprotected. Formfields don't work in unprotected Sections. You also don't need Section breaks in a document using the 'Filling in forms' protection unless you need to leave part of the document unprotected.

You mention using Word 2007 as well. Do note that the content controls and active-x controls one can use on PC versions of Word don't work on Macs.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]