Tried this plugin on new site being developed on WP 3.6, since the other pop-up plugin CW2 won't work either with 3.6. Had this at least working before the 4.5 update today but now the pop-up will not appear at all.
With the previous version, the pop-up would appear on every page regardless of settings.
Also, the configuration preview page comes up now with a 404. Apparently this is due to the site being on a shared host and not being the primary site; as the plugin insists on using the absolute path (or Site URL) to the domain instead of the Home URL for calling the preview page.
Apprently WP 3.6 is causing real fits with the pop-up plugins and hopefully this will get worked out soon.