Single Post not displaying content

I’m running the Athena Pro Theme on my website, and we’ve been recently having issues with the single.php for posts. The post content is no longer displaying on the theme. I tried the usual disable all plugins, but it seems to be with the theme itself. I also tried switching to another theme, and it does indeed fix the problem, and the posts display the content completely. Do you have any idea of where to look to try to fix the problem? Example page with errors (no content): http://divorcingdivas.com/parenting-during-and-after-divorce/