Google should never be seeing zenid in your URLs if your server is properly configured. And customers should only ever see it on their 2nd click and then it should disappear on all subsequent clicks. If it's not disappearing then you've got something wrong with session configuration ... and that could be caused by your custom .htaccess rewrite rules, especially if your configure.php HTTP_SERVER and HTTPS_SERVER have a different domain than what you're rewriting the URLs to. (ie:
www.site.com vs site.com without the www.
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