Google found a way to bypass Adblock on YouTube. Saw a few today myself, but forgot about Googling it to see what the deal was. Basically, Google took their (skippable) ads, and put them in as part of the actual videos. Essentially taking a minor nuisance, and turning it into a 3 minute snoozefest that can't be skipped. The problem seems to be related to how Adblock discovers ads, as Google changed how they were placed on YouTube. Simple fix is to delete the YouTube app, as that seems to be the culprit. Not 100% on this, I haven't tested on my PC. But Adblock released the above fix. It's only effecting Chrome users at the moment.