Apple Handwriting Recognition (Ink) Causing Stuck Pixel on Cinema Display?!

I knew you wouldn’t believe me, so I made a movie to prove it. This is on a macbook pro 15″ with a 24″ cinema display. The dock and menu bar are running on the laptop display. If I mirror or move the dock and menu bar to the external display, the problem disappears! If I plug it into another external display, it does exactly the same thing.