We are seeing another potential issue with WPML, as of the update to 4.6.7 the preview functionality no longer works. If we make an edit to a post and click the "Preview in new tab" button, the edits are not visible in the previewed page. Can you confirm on your end? This is tested on our live site, staging site, and a clean WordPress install with only WPML active.
This issue has been escalated to our developers and will be fixed in a future release. In the meantime, as a workaround, you can comment out this line in wp-content/plugins/sitepress-multilingual-cms/classes/ATE/Review/ReviewTranslation.php:
remove_filter( 'the_preview', '_set_preview' );
I'll update here once we have the confirmation that it has been fixed in a release.