It looks to me as if the SO favicon just changed to some weird red and blue thing with the text "jB". Did anyone else notice this? And what does it stand for?
I had a similar problem a few months ago. When I posted I got downvoted, accused of making it up, even using Photoshop to fake the evidence. So it's a relief to find that somebody else has suffered it.
I have since discovdered the source of my rogue icon - it was Nick-D's avatar.