Whenever I push the crop button, no matter how small I made the crop, or anything, it just hangs on the progress bar. It doesn't seem to ever load the crop_image.php. I can even move that file and it changes nothing. It hangs as long as a browser will tolerate. Windows and Mac and several browsers.
The only thing I changed so far was the path to imagemagick binaries. I made the demo-images folder 777.
I should add I tried it on a different server and the crop_image.php seemed to have a problem only with the exec actually producing the image. It seems that included by ajax it doesn't work. Sending the same parameters to crop_image.php does work, or at least it echos the right variables.