Neither your original nor revised docs contain comments either so I wouldn't expect comments in the compared doc. What makes you think there should be comments in the compared doc?

However, there seems to be some corruption in the Compared Doc because I can't display it in Print View (where I normally see the comment balloons). It keeps flipping the view back to Draft every time I change to Print Layout. Other views seem happy enough to display. If I accept (or reject) all revisions then I can go to Print Layout view but there are still no comments in the document.

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Andrew Lockton
Chrysalis Design, Melbourne Australia