just saw this at http://espn.go.com/ on Bon Echo from 2006080409. Popup notification indicated 2 popups were blocked. neither is listed in the Option menu.
We know this happens, but we're not going to block on this. There's some cases where we can't do this properly, aiui, and that's not likely to change on branch.
This issue is just a 'temporary' fix for bug 235450, because the URL for the popup window is just not the URL what actually is intended to being loaded in the popup window.