Changing GPS coordinates in PSE 9?

Question

Typically I import pictures from the camera into PSE 9, then change the GPS coordinates as needed in GeoSetter (because it's much easier there).  Back in PSE 9, I use "update thumbnails", and can verify the new lat/long coordinates when I view the metadata in the properties panel.  However, the locations on the map do not change.  (I believe they were in PSE 5, though.)
Is there a way to update the map locations from the picture files?  PSE 9 must create a separate table of locations that doesn't get updated with "update thumbnails", even though the metadata is updated.  I suppose I could delete the pictures and re-import, but then some of the caption/tag/collection data may be lost, depending if PSE 9 re-creates tags from keywords (and I know collections aren't written to keywords).
Thanks,
John S.

Answer 1

Upon further investigation, here's what is happening:
- When I change the GPS coordinates in an external program (GeoSetter), the new coordinates are written to the GPS fields in both the EXIF and XMP data.
- When I hit "Update Thumbnails" in PSE 9, those new coordinates are read into PSE and are visible in Properties/Metadata, but are not reflected on the map.
- After I change the caption and tags in PSE and hit "Write Keyword Tag and Properties Info", the new coordinates in the EXIF and XMP data in the actual file are overwritten with the old coordinates!
Obviously PSE 9 is storing the GPS internally and not updating with "Update Thumbnails".  So I guess my only solution is to change the GPS data before the photos are ever imported into PSE 9 -- unless someone knows how to update the coordinates internally, which was the point of my original post.
Thanks again,
John S.