I tried your fiddle and I removed moxiemanager plugin, and It worked
<script type="text/javascript" src="js/tinymce/tinymce.min.js"></script>
<script type="text/javascript">
tinymce.init({
selector: "textarea",
plugins: [
"advlist autolink lists link image charmap print preview anchor",
"searchreplace visualblocks code fullscreen",
"insertdatetime media table contextmenu paste "
],
toolbar: "insertfile undo redo | styleselect | bold italic | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | link image"
});
</script>
<form method="post" action="somepage">
<textarea name="content" style="width:100%"></textarea>
</form>
Looking on the google for it I discovered this question that It probably solves the issue