Hi the site used to work until the update to WordPress 5.6. I have the site working in Chrome but not in Firefox since the latest update to 5.6. In Firefox the home page loads, in Edge random pages load and others do not. The problems began with the WordPress 5.6 update. I tried the default theme, and it works, but obviously the site doesn’t look the way I want it to. I am using THETA child theme and the Kirki Customizer Framework. In checking the logs, I get: PHP Error: Request security check failed (POST /cpsess3671603877/3rdparty/roundcube/index.php?_task=mail&_action=refresh)Not sure what to do. This is not my site, this is someone else’s site. My site works fine since the update. Hope someone can help. Thanks in advance.