Single Post Pages not showing up.

Howdy Folks,
I’m trying to fix a site for a friend, they have a custom theme based on inberlin. I’ve been troubleshooting for countless hours and no luck.
So here’s my issue, single post page will not show up in my theme, only the title shows, the full post show up if I create a categories page, but if you click the link to the individual page; no dice.
They show up if I switch to a default theme. I’d rather not rebuild this theme from scratch so any help would be much appreciated.

working categories page: http://linetravelingcircus.com/category/tc-sideshow/
non working post page: http://linetravelingcircus.com/2011/04/e-p-i-c-monthly-5/