Images in header containers cannot be edited or replaced

I just downloaded the Emerald demo on Friday. There's no way for me to change the two images in the two header containers. I can click on each container and change everything except the image. When I look at the containers in the "List View" it doesn't list any images even though they both contain the starter image that came with the demo. When I look at the containers below the header they all list the displayed images and allow me to edit or replace them.