Maron Theme (Appendipity) Header Image

The header image for my website http://edacious.co suddenly decided to disappear. Any ideas? I’m using the “customize” menu provided, uploading the image, and nothing. I tried .png, .jpg, but it’s still just a white nothing.

Is there a way to “hardwire” the image to appear by putting code somewhere? I’ve emailed the developer and he doesn’t have any ideas either. Thanks in advance!