If you’re staring at Elementor’s beautiful gray loading screen and the editor just won’t load your content, it could be your server-side security settings. HTTP Headers are essential to keeping a site locked down and less desirable to hackers but you have to balance function with that security. I’ve found that setting your Content Security Policy header frame-ancestors option to “none” will prevent Elementor from loading. The next best option seems to be setting frame-ancestors to “self” which should resolve issues for those websites with aggressive security policies.