I changed our banner ad atop our page by simply pasting the image html over the previous one. I've done it several times before, but now the header is blank, except for the main header image, which is our company logo. It also made another icon that used to sit to the right of the header image disappear. I double checked and everything is still entered correctly. The two images that should ordinarily be next to the header logo don't show up.
I did initially upload the wrong size banner (since that's the size I was sent, which had never happened before), but then, once realizing it was too large, cropped the banner on an image editor then uploaded it fresh again.
See what I mean at http://www.utahstories.com/