UV Image Painting / Texture Painting in 2.53

I’ve got the same image in my UV map and my 3D ortho. The UV window is in image painting mode, the 3D in either Texture Painting or Object mode.

From the docs I expected when I drew on either window, the other would immediately update, but they don’t.

What am I missing here.

Have you checked “update automatically” under view -> update automatically ?