There are a few common reasons that may prevent the popup from displaying correctly. Before opening a support ticket, please review these.
Log in to your account and make sure that the campaign is not disabled. The campaign could have been disabled automatically or manually, so first, ensure that it is active.
Invalid or Missing Doctype Declaration
If your website dims, but the popup is not displayed or is positioned incorrectly, it is likely due to an invalid or missing doctype declaration. To resolve this, just add<!DOCTYPE html>to the very top of the HTML code for your web page.