Hi Uriel,
As you mention, change-is-change.
As you did not get the change prompt on a blank document - a guess, not being able to see your documents obviously <g>) would be
that one of your documents where you do get that prompt may contain a date (Insert=>Date with the update choice checked) or other
data that is changed by the computer, not necessarily by you. The problem is going to be that the add-ins, for example, don't
always announce themselves as far as what changed.
If you have a specific document where you're seeing this behavior you can try a couple of things.
1. Start Word in Office safe mode (hold ctrl key when starting Word) then use File=>Open to open that 'changing' file then close
it without doing anything else. Still getting the prompt? Then probably not an add-in as safe mode is supposed to keep them from
running on startup.
2. With the 'changing file' open use Alt+F9 to display many of the 'field codes' within the document to see if there is one there.
A date field for example can be formatted to *show* time, not just date, but the field updates based on its capabilities usually not
just the chosen display format.
Smart Tags are one of those 'built in features' in Word 2003

They try to find things like addresses or contact names in your
documents and mark the document to show that they may be linked to more information (phone number etc). You can turn them off in
Tools=>Autocorrect Optins and Tools=>Options
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Well, fair enough, if you've printed and the doc contains a changed
last-print-date, that's a change.
Add-ins, if they make changes, cause changes. So fine.
The date field -- sure, IF it's been updated, then that's a change.
Some of your other examples I don't really know about. (Don't use smart
tags, data links.) But what's difficult about the principle here? A change
is a change. Not-a-change is not a change. >>
--
Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
For Everyday MS Office tips to "use right away" -
http://microsoft.com/events/series/administrativetipsandtricks.mspx