If there are no tracked changes or comments in your document, then Final
view would look the same as Final Showing Markup view. Word 2002 and
later open in Final Showing Markup view to let you know that your
document contains tracked changes and/or comments, and to save you
possible grief from inadvertently sending the document out that way.
This is a security feature intended to save you from yourself.
Track Changes mode is a toggle setting that Word should remember, so
once you turn it off, it should stay off until you turn it on again, and
vice versa. If that's not how Word behaves in your installation, then
there could be a problem with your Word data key, and you might try
closing Word and renaming Word's data key as described in
http://word.mvps.org/FAQs/AppErrors/MissingMenusEtc.htm .
