Old dog wins

It's official. Pop-Up Disabler allows some forms of pop-under ads to get through. Pop-Up Stopper doesn't. Period. End of story. I tried reinstalling the challenger (after switching back to Pop-Up Stopper and going two whole days without a pop-under) and within 12 hours, I had seen my first pop-under. That's conclusive proof as far as I'm concerned. I'll "put up with" clicking on a Ctrl-key if I have to, to make my authorized popups appear. Who knows, with a bit of improvement, the challenger may yet return.