MonaLisa files are corrupted (I can't open them with normal image processing software that supports jp2).
I was able to open those Mona Lisa pics just fine in Photoshop with Fnordware's free JPG2000 plugin... http://www.fnordware.com/j2k/
Very weird though: I got the plugin to work and show me the fractal image. Then I changed the source to point to one of the mona lisa jp2's, but launching it kept showing me the fractal instead??
Made sure that I hadn't locked the code, and no quick build enabled. Weird.
(It does seem a bit unfortunate that the loader seems sluggish -- the same JP2 images load many times faster in photoshop than in blitzmax with the jasper plugin)