It is, in fact, a progressive JPEG - the Squeak reader can't handle the
16rC2 marker.

You can find a "normal" and "progressive" of an image at:

http://mgddk1.niddk.nih.gov:8000/NCD/m/pjpeg/pjpeg-e.html

The progressive one will die the same way as the image we're talking about.

-- Duane