I have run all the spyware, malware, virus and bug software...it was the first thing I did. My system blocks ads and pop-ups just fine, always has. This is neither. It's a website that takes over this one, just as if you went to another site.
If you watch the bottom line, the one that usually says 'done' or 'opening...', just before the site switches, it goes through a bunch of URLs for doubleclick, googleads, big ad moguls like that. It started just after Patrice posted the introduction to the new Admin so the combination of those two 'coincidences' is what made me wonder if the QB site was controlling, or at least responsible for, the take-overs.