Glad the problem is solved.
About JGP: when it has been edited by a Mac, then Cardbox can met problems reading such a file.
In that case the best way to add such an image into Cardbox is by launching it in a program that has no trouble with it, copy the image to the clipboard, than paste the image into your image field. Then there is no problem. Using copy/paste gives also a little better image quality in Cardbox.
Because the image read options in Cardbox are a little limited I developed some macro's for this. They use the free image viewer IrfanView which is very fast and has a programmable command-line interface. In that way of working also all available Exif data can be read/stored. The more, also many, many types of images can be added then into Cardbox using that macro.
Btw, please download and install the latest build (4408)! It is simple and free.
The more you use Cardbox, the more you will enjoy it. I use it more than 25 years.
Regards
Bert