Hi @broslavski
Thank you for contacting Elementor Support.
Please follow these troubleshooting steps: https://elementor.com/help/elementor-widget-panel-not-loading/
I hope this helps.
Kind regards,
Thanks for the reply, but when I rolled back the plugin version to the previous one, the problem went away immediately. Accordingly, the problem is not related to PHP or server configuration, but to changes in the new version of the plugin.
Today my problem with Elements block loading went away after updating the theme. Maybe someone will find this information useful to submit a request to the theme developers about compatibility with the latest version of Elementor.