I have the same version.
I just looked in the error console. the body part looks like this
style="background-image: -webkit-canvas(c2csscanvas); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; cursor: pointer; background-position: initial initial; background-repeat: initial initial; "
Notice cursor: pointer; <-- it toggles between 'auto' and 'pointer' when I keep the mouse hovered over the sprite.
Also what's with the 'backgroun-position' and 'background-repeat'?
Shouldn't that value be 'initial' rather than 'initial initial'? .. chrome error console style show it marked mistake anyway.