On 18 Apr 2012, at 16:09, THDW wrote:

[...]
> I have found out what the problem was.
> 
> My publisher had sent me the Word file in .doc format. For Nisus to open the file with all the tracked changes, it should have been saved in .docx

NWP (with LibreOffice import filters) can convert and display track changes saved in both doc and docx files created in Microsoft Word.

Check your import filters (from NWP Preferences>Advanced). They should be LibreOfiice import filters (which is set by default).

Hamid