Renaud Flavigny reported problems with pictures imported by Photoshop
Element or Adobe Bridge. These software seem to alter a NikonPreview
EXIF tag which forbid latter EXIF writing with EXIFTool or GPicSync.
He wrote a command-line utility to fix this problem.
More informations and a link to his utility can be found here:
http://code.google.com/p/gpicsync/issues/detail?id=39
francois