When we activate Multisite Theme Manager it breaks the layout in the Page admin editor if you have Elementor page builder plugin installed.
We have narrowed it down to something in the plugin stripping a CSS class from the opening body tag or causing that class not to load which breaks the Elementor plugin.
Steps to reproduce:
Download and network activate the Elementor plugin from wordpress.org
Plugin works fine at this point
Download and network activate Multisite Theme Manager
Elementor plugin layout is now broken
When you compare the rendered sources of both the working and non working page you will see the only difference is that in the opening body tag the CSS class “elementor-editor-inactive” is missing.
We really need a fix for this urgently as we require both these plugins to launch our service and despite our best efforts we can’t pin down what in the plugin is generating this bug.