(15 Jun 2016, 9:05 am)Adrian wrote Thanks. It's similar to what I've witnessed on other sites, and it appears to be down to Google's vetting of ads.

It's really concerning that this is affecting users though, and I'll flag it up.

Please keep reporting in the meantime.

Jimmi's was identical to mine. I'd just posted in the arriva news thread when it came up - not as a pop up, either, as chrome still said I had the same number of tabs. I navigated away using my bookmarks, rather than clicking on any crosses. It was all the more alarming because it triggered a tone and made my phone vibrate when it appeared. I could imagine someone like my MIL being quite thrown if she got this.

Have never successfully taken a screenshot on my phone