This theme does not work with “Shortcodes Ultimate” plugin as well. If I set to “ON”, I cannot use Appearance/Customization. “Serious problems”… 🙁
It seems it was not worthy to buy the pro version…
If your site’s customization screen starts malfunctioning when activating a plugin, that’s more of a plugin issue than a theme one.
Does the plugin work correctly and all WordPress configuration screens remain functional with any of the default Twenty themes?