Google is so sensitive these days

Check case of all your Google App Engine static files, as it would seem it's much pickier live, than local.

Working locally, not live

<script type="text/javascript" src="/scripts/jquery.jcrop.min.js"></script>

Works on both

<script type="text/javascript" src="/scripts/jquery.Jcrop.min.js"></script>

Posted by Effisfor