WPML – featured images and upload gallery error

Unfortunately, I have a problem with WPML do not know if you are able to help, but worth a try :)

I would add that when I WPML turned off everything works fine.
Unfortunately, when is turned on I have a problem with the pictures.
When I add a gallery to a post at each of the loaded image appears: Error loading the server, try later. But when I close the window adding galleries, and open again. The images are loaded.

Another problem is the featured images. When I select a picture post it appears in the grid gallery, but does not appear in the edit post or the list in the admin panel.

Thank you for any help.