Wow, this is a new one for me. FSpot has deleted the makernotes but left in the makernote tag with a data length of zero. Since it is not uncommon for some cameras write a data length which is too small, exiftool allows the data to run outside the specified bounds. Unfortunately, for this image this results in exiftool reading complete garbage for the makernotes. This is actually exiftool's problem, and I will add a test to prevent this from happening. What FSpot really should have done was just remove the makernotes tag (since the data itself is already gone). You can do this with the following exiftool command:

This, apparently, is what Flickr did too.

So the bottom line is that FSpot deleted your makernote information, and there is no way to restore it unless you made backups of your original images. :(

- Phil