It's been going on since this morning. It's when I scroll down the page. It's a bit like the page has split into three separate pieces, lengthways. And the middle section scrolls marginally slower than the two outside sections. So it looks juddery and odd. Not happening on any other site. Been going on all day. I even went away and had a buttery crumpet and a hot tea, but it's still doing it upon my return.
Classic, IE9, Earl Grey, 32D, Scone to rhyme with Chrome.