If anyone will ever have these issues, here are some solutions:
-
deactivate WP UI plugin – but if you still want to use it, try to modify
wp_register_script( ‘wpui-script-before’, site_url( ‘?wpui-script=before’ ), ___something___ );
to
wp_register_script( 'wpui-script-before', home_url( '?wpui-script=before' ), _____something_____ );
in:
/wp-content/plugins/wp-ui/wp-ui.php
/wp-content/plugins/wp-ui/admin/wpUI-options.php
/wp-content/plugins/wp-ui/inc/widgets.php
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