It looks fine in the Dash (Customize screen) but doesn’t show up on the actual page in Chrome. In Safari, it’s even worse – there’s a huge blank with a tiny question mark where the header photo should be.
Custom Header is disabled; I’m not using a logo, just a header photo. I hid and re-added the header photo with no change. I have cleared cache, rebooted, and refreshed, to no avail.