I'm not sure if it's the same thing, but the ad for the Unwanted Sexual Overture Center* opened up 4 pop-up windows today around noon when I was in the User Control Panel. I was able to make it do it again an hour later but have not seen the ad in question since. From reading this topic, it would seem that the originating site is doing it, rather than the IDPF site.
* "Schadenfreude alert! D'Angelo indicted on 39 counts," 10/10/2007 viewtopic.php?f=37&t=26231&start=0