Hi Tom, thanks for such an awesome theme! I had been having a lot of troubles trying to get my temporary header background image to be responsive and to look the same on desktops, laptops etc., and in looking through the forums I saw where you explained why background images have difficulty with that. So I tried just putting an image into the wp_head hook and that solved it.
But it added a new problem that I haven’t been able to solve – it adds a small white space between the bottom of the image and the top of the menu. I have Layout Header padding set to 0.