When I click the search icon and then the Advanced link, the browser screen darkens and no popup appears. I seems like the page thinks the popup appeared because when you go to hit back the notification about loosing changes appears. I've tested this on Windows 10 Chrome, Firefox, and Explorer and also on Windows Server 2008 R2 with Firefox with all the same results. I've also tried zooming all the way out and alt-tabbing. I'm trying to add a new filter.