I performed a full-system malware scan before I started this thread using fully updated versions of:
Avira AntiVir Personal
Spybot Search & Destroy
Windows Defender (yes, I know that WD is practically worthless, but I use it anyway
They found nothing, BTW.
I did find out that these pop-ups are Flash-based and that I hadn't enabled SpywareBlaster's IE Flash killer after recently reinstalling Windows, so problem solved.
These Flash pop-ups occured during page loads only here at LF, and nowhere else.
"They should rename the team to the Washington Government Sucks. Put Obama on the helmet. Line the entire walls of the stadium with the actual text of the ACA.
Fix their home team score on the board to the debt clock, they can win every game 17,000,000,000,000 to 24. Losing team gets taxed by the IRS 100%, then droned."