I have a header image (graphic of logo and title) that is the proper 1200 x 150 px dimension. It scales, as does the slider and widget graphics, perfectly when in “wide” mode. But as soon as I switch to “Boxed” mode in the Nirvana header settings (with “force responsiveness” enabled), it no longer scales responsively. The other images continue to work perfectly, just not the header graphic in “boxed.” How can I fix this? My client prefers the boxed mode but we need that header graphic to scale.