I noticed with the latest version of WordPress, an older template may not display the sidebar correctly. If you look at the source code, you notice a lot of HTML code is missing in the sidebar div. The easiest fix I found was to update the “sidebar.php” file in the template. A lot of themes should have the !function_exists(‘dynamic_sidebar’) in the sidebar.php file.

In the following code:

if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('south_sidebar') ) :

Remove the ! from the function_exists portion. This should allow the “original” sidebar to display properly. It should look something like:
 
if ( function_exists('dynamic_sidebar') || !dynamic_sidebar('south_sidebar') ) :