Kirk:
Thanks for such a quick reply. Being new (still on trial), I may be misunderstanding your answer.
I ran another test and my test Caption, City, State, Country and "Star" rating were all written to my NEF file, as well as to my JPG. Here's what I did:
1)... (in Photo Mechanic) ... Edit>Preferences>IPTC/XMP ...
2)... in the area labeled "For TIFF-based RAW", I unchecked the box labeled "Add embedded IPTC". All other boxes in this area are also unchecked.
3)... while in the contact sheet view (and still in "JPG+RAW" display format), I entered a few test entries (Caption, City, etc.).
4)... minimized PM
5)... opened Expression Media ... Action>Sync Annotations>"Import Annotation from Original File" ... clicked "OK".
6)... viewed JPG and NEF files from within ExMedia, side by side. Both files had my test entries written to them.
7)... silently cursed to myself.
What am I doing wrong?
Thanks again for your help,
Dave