Problem:
The shortcode [wpml_language_selector_widget] used for showing the language switcher in the header includes the path to the CSS file like so "sitepress-multilingual-cms/templates/language-switchers/legacy-list-horizontal/style.css?ver=1" It is missing the HTTP or HTTPS part, which can cause a security issue.
Solution:
Our developers checked this issue and concluded that there was no security risk by not having the HTTP or HTTPS part in the CSS URL link, and it should not be included due to a specific reason.
Problem: i get the following error in WPML > Support > Advanced Translation Editor: "Site Moved or Copied - Action Required - ATE communication locked"
Solution: This is happening because you haven't selected a choice in the notification about what to do with the migrated site. when this happens it's very likely that there's a plugin or a custom code interfering with the notification trigger. disable everything and use the default WordPress theme "twentytwentyone" and you'll see the notification appearing in WPML > Translation Management.