I am trying to create a post list in a sidebar and the post content in the center. The post list consist of posts that are in one category, and I add a piece of code that makes that list from a category slug (to prevent breaking when moving to a other wordpress installation).
My problem is that it doesn't show the content of the post when I click a link in the sidebar. Problem example: http://cccp.de-kleijn.com/?cat=8
Below is the code of single.php that is used in the above example. What is going wrong here?
[code moderated - please follow the forum guidelines for posting code]