No real modification in the plugin it-self, but we heard people complaining about the lack of actual back-end cropping script. We listened to you and here it is. We added a PHP file to the download package. Just go the plugin download form, and check the new box.
This script will probably need some adjustment to work in your environment, but the biggest part is done. You can get it work by simply changing a few variables, and making sure the proper parameters are submitted to the script.

WE TESTED THIS SCRIPT AND IT WORKED.

So if it doesn't work with you the reasons could be :
-GD library is not installed. It's the php library to edit images. You can find more details about it on php.net.
-the image path is wrong. Make sure you set the image path variable correctly at the beginning of the script. The source image must be located in that folder.
-the source image file is not found. Can be fore two reasons: either the image path or the image file name is incorrect
-Apache does not have the permission to write in the destination folder Most common error, make sure apache is owner of the folder, or writing permission. If the target folder doesn't exist, the script will automatically create it, making apache the default owner