Try this to get rid of the “Loading original image for cropping problem:
In the plugins folder, open wppt_admin.php.
On line 94 find:
$original_file_URL = WP_CONTENT_URL.’/uploads/wp-post-thumbnail/’.$wppt_general_options['original_file_name'].$_POST["force_refresh"];
Replace it with:
$original_file_URL = wppt_general_options['upload_path'].’/’.$wppt_general_options['original_file_name'].$_POST["force_refresh"];