I suspect this is not a WordPress issue, but because it also appears in my editor screen I am going to ask the question here ... what is this black box with white text that keeps popping up only on my WordPress website? In this case it doesn't even have accurate content in it. Nowhere on my page does it say "look at your strangely". So where on earth does it get that from????
I'd love to get to the bottom of this as it's very annoying. Actual post URL is http://www.travelnasia.com/thailand/grand-palace-bangkok/ and I am seeing this in Google Chrome and in Firefox whether logged in or not, so it's probably not the browser doing it.