There are custom backgrounds on almost all the pages of this site. But most of them are not showing. They were showing perfectly, but now they have disappeared. Here's a page where the custom background shows correctly: http://www.terrybisson.com/this-month-in-history/ But this one is not showing. http://www.terrybisson.com/life-works/ The screenshot shows that the background is still showing in edit mode  Am I doing something wrong? Thanks!