Hi Heather,

I apologise for any inconvenience caused. We don’t use cookies for Content Randomizer plugin. We are using WP_Query to get the posts from the DB (The function name is get_random() in randomizer.php https://github.com/elementous/content-randomizer/blob/master/randomizer.php). In order to exclude a certain part of HTML from caching, you need to load content asynchonrously using AJAX. This feature is not implemented. We’ll work on this on the next version of the plugin.