I've had adsense on a portion of my website pages for many years, in a 728x90 banner slot. I've not changed any code relating to it recently. Suddenly, as of a few days ago, I get occasional pop-overs. I load up the site, with an advert on it, and when I click another link on the site the whole page blurs, like frosted glass, and in the middle is a portrait-oriented version of the advert that was showing on the page previously.
I HATE it. And I feel it's against Google's best practices etc. Does it mean my adsense code is getting hijacked somehow?
For now I've commented the adsense code out, and my site now has no adverts and no pop-overs.