Bugs in content types

When trying to upload specific MP4 videos, it fails to upload and gives the following error:

SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data

Maybe it's because they are long videos, I don't know.

Any solution for this?

JH

In WordPress, one of the settings is "Allow logged-in users to resume tasks"  This is a great option. But when I enable it, it prevents non logged in users to even see the content. Is there a fix?

Sorry for my english, 

Since I've update H5P, many exercises are not displayed on my wordpress site. Someone have the same troubles ?

config :

WP4.2.4–fr_FR

H5P 1.5.3