@esmi you're not understanding me. Under Appearance>Header I can now choose to either upload an image from my desktop (which has always been there for themes that support this kind of customization) OR I can now select an image from my media library and use that as a header. This is a new, and welcome addition. In previous versions of WP, if I changed themes, I had to upload a new header image from my desktop, even though a perfectly good version of the header existed on the server. So this is the patched hole I'm referring to; but I will probably direct users to the customize link, instead of the submenu of Appearance, to make these changes, where I can't take advantage of this new functionality, and have to again, upload from my desktop every time I change themes.