I have been trying to use an iframe within a XF page and the header disappears when I save it, I have tried changing the URL for the iframe source and it does the same thing, the header and footer do not display leaving the breadcrumbs, the iframe and the surrounding page. I am logged in and when I click on the down arrow on the breadcrumbs I get this too: undefined: Security error occurred. Please press back, refresh the page, and try again. Not sure if this a bug globally or an issue of my own. Either way I would love to know how to fix this or for it to be fixed. Thank you.