Wordpress post editor almost gone

Hey!

Some of the users on my multisite, has experienced that they can't write new posts anymore, because their editor does not show up. The only thing they get when clicking "New Post", is post options at the top and post title.

This is only happening to a few users on the site.. I have tried to deactivate all plugins, and tried to switch theme.

See the attached image. Anyone who can help?