You’re right, this was not a right-related issue I have an extension that blocks referrers an it does not play well with AWS 
Markdown editor + preview: event form is embedded in the preview (the cog displays a modal with the “advanced” event editor)
Markdown editor, no preview: event form is in a modal, button to switch editors is in the modal footer
Rich text editor: event form is embedded in the editor (the cog displays a modal with the “advanced” event editor)
