Upload of H5P Quiz

I was trying to upload a H5P crossword quiz created on Moodle in this site. While the quiz got uploaded in no time i am getting a pop up saying "loading please wait" and it never gets over and the quiz is not getting saved. What could be the reason for this. Is it something to do with H5P libraries on Moodle and if yes what is the way out to get the quiz saved.