Reported for: WooCommerce Multilingual 3.5.2
Resolved in: WPML 3.5.2
In the 3.5.2 version of WPML, some files related to the Twig library and used by the plugin, are missing.
This may produce a PHP warning on some pages, similar to this one:
PHP Warning: include(/var/www/example.com/wp-content/plugins/sitepress-multilingual-cms/embedded/twig/twig/lib/Twig/Node/Expression/Test/Defined.php): failed to open stream: No such file or directory in /var/www/example.com/wp-content/plugins/sitepress-multilingual-cms/embedded/composer/ClassLoader.php on line 412
We updated the release archive so that it includes the missing files.
A proper action if you encounter this problem is to re-download WPML.