Image Crop Editor Not working
I had the same issue but the problem was missing the GD library, https://www.digitalocean.com/community/questions/installing-the-gd-image-library
To install (Linux/ Apache2):
sudo apt-get updatesudo apt-get install php5-gdsudo service apache2 restart
I faced the same problem and got it solved. This may be a very late response, but can be useful for other people facing this problem. This is how I resolved it:
Check your functions.php file. See, if you have the closing tag at the every end of the file.
?>removing this tag fixed my problem. Also can check out this link. Hope this helps!