GPS Data Logger Software - BT747

I am a new user trying to GeoTag Canon raw (CR2) files.

In the "Files to Tag" window I have opened my image files and have highlighted the images I wish to geotag. The lat long fields have automatically been filled in with the correct lat long data so I assume I am now ready to update my image files with the gps data.

When I click on "Save Tagged Files" I don't see anything happening and when I go back and check the original image files none of the lat long fields have been updated.

"Tag from File" is set to the default "Convert inplace............"