This thread is resolved. Here is a description of the problem and solution.
The posts in the "Recent Posts" widget were linking to the same (wrong) link, no matter on which one you were clicking (the normal behavior is that each post should go to its own link).
The Cornerstone support team said that their plugin is compatible only with WPML 4.2.5 at the moment (our latest version is 4.2.6 at the moment - 23 may 2019) and offered a solution to the client:
- Edit the file "wp-content/plugins/cornerstone/includes/classes/components/class-wpml.php"
- Disable this line:
add_filter( 'the_permalink', array( $this, 'filter_permalink' ) );
- Save the changes.
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