Gallus Moll: I've seen the ad you describe on the forum page, but for me, it was well-behaved. It stayed at the top of the page where it belonged, and when I scrolled down, it disappeared off the top of the screen like any other ad would. It never blocked my view of anything.

I wonder if there is something quirky about your browser that makes/allows this to happen?

I sometimes use a Mac with Firefox, and sometimes a PC with Google Chrome.