Nice theme. I want to set up the front and back cover images. I go to Appearance>Theme Options>General, and upload both images for the Front cover Image and Back Cover Images, respectively. However, no matter how many times I try, the space there remains blank; no image shows up. As if I had not uploaded anzthing. Even when if does not show up, I press Save and still nothing shows up. It seems the uploading does not work….