Elementor not loading (WP v5.0.2)

The everlasting story: Elementor starts into grey screen and never comes up again – even on a completely fresh setup without any plugins or themes exept twenty nineteen!

My system info:

== Server Environment ==
Operating System: Linux
Software: Apache
MySQL version: MySQL Community Server (GPL) v
PHP Version: 7.2.12
PHP Max Input Vars: 1000
PHP Max Post Size: 200M
GD Installed: Yes
ZIP Installed: Yes
Write Permissions: All right
Elementor Library: Connected

== WordPress Environment ==
Version: 5.0.2
Site URL: https://www.domain.tld
Home URL: https://www.domain.tld
WP Multisite: No
Max Upload Size: 200 MB
Memory limit: 256M
Permalink Structure: /%postname%/
Language: de-DE
Timezone: Europe/Berlin
Debug Mode: Active

== Theme ==
Name: OceanWP Child
Version: 1.0
Author: Nick
Child Theme: Yes
Parent Theme Name: OceanWP
Parent Theme Version: 1.5.32
Parent Theme Author: Nick

== User ==
Role: administrator
WP Profile lang: de_DE
User Agent: Mozilla/5.0 (Windows NT 10.0; rv:64.0) Gecko/20100101 Firefox/64.0

== Active Plugins ==
Classic Editor
Version: 1.3
Author: WordPress Contributors

Duplicate Post
Version: 3.2.2
Author: Enrico Battocchi

Elementor
Version: 2.3.8
Author: Elementor.com

Email Address Encoder
Version: 1.0.12
Author: Till Krüss

Enable Media Replace
Version: 3.2.7
Author: ShortPixel

Google Pagespeed Insights
Version: 4.0.1
Author: Matt Keys

iThemes Security
Version: 7.2.0
Author: iThemes

MainWP Child
Version: 3.5.3
Author: MainWP

MainWP Child Reports
Version: 1.9.1
Author: MainWP

Ocean Extra
Version: 1.4.30
Author: OceanWP

UpdraftPlus – Backup/Restore
Version: 1.16.0
Author: UpdraftPlus.Com, DavidAnderson

WP Staging
Version: 2.4.7
Author: WP-Staging

== Must-Use Plugins ==
WP Staging Optimizer
Version: 1.1
Author: René Hermenau

== Debug ==
Errors:
SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://www.domain.tld/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.3.8 – 2:0
2019-01-06 20:04 +00:00
x 4 times

SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://www.domain.tld/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.2.7 – 2:0
2019-01-06 19:26 +00:00
x 8 times

SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://www.domain.tld/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.3.8 – 2:0
2019-01-06 19:14 +00:00
x 3 times

SecurityError: Blocked a frame with origin “https://www.domain.tld” from accessing a cross-origin frame.
at https://www.domain.tld/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.3.8 – 2:99462
2019-01-06 18:50 +00:00
x 2 times

SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://www.domain.tld/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.3.8 – 2:0
2019-01-06 18:43 +00:00
x 8 times

This system info relates to WordPress v5.0.2 + OceanWP v1.5.32 + Elementor v2.3.8. To be sure I made a completely fresh WordPress v5.0.2 setup without any themes or plugins. Then I installed only one plugin – Elementor. And guess what – neverending grey screen.

I spent hours and days of my spare time in recherche dealing with tis error. Finally a decision had to be made and so I changed the theme and the editor. I have to finish a project and my customer shurely won’t pay the time I spent to unfortunately find no solution. Bad luck.

I hope the developers will find a way to fix this problem in the future for I am definitely not alone in the dark. But for now I have to say bye bye to Elementor. It’s a shame, because I’ve seen Elementor in the past as a very promising alternative to other editors. But I just need a reliable tool, even if I have to accept other disadvantages.

Cheers, Arthur