Hi Rob,

I'm glad you sorted it out. As you have discovered, sometimes when exiftool issues a makernote warning during writing it will fall back to just copying the offending information as-is instead of trying to restructure it properly. In your case this also caused the format error to be copied, although without seeing the image I can't tell what the specific problem was. I usually use the htmldump feature to debug this sort of format problem in case you're interested.

- Phil