Gallery Pro has been coded to disable the WordPress Site Description/Tagline from appearing under the Site Name on the front of your website.
However, it is still recognized and readable by the search engines.
Since the code is removing the Site Description/Tagline from being used, you will need to restore this functionality. To do that you will need to follow these steps to modify the code.
Browse over to the Gallery Pro theme folder. Open up your functions.php file. Look for this:
// Genesis Changes
include_once( get_stylesheet_directory() . '/inc/genesis-changes.php' );
Copy and paste the following code right below it. (Must be BEFORE “Theme Defaults”). Then Save it.
// Enable Site Description (Tagline)
add_action( 'genesis_site_description', 'genesis_seo_site_description' );
Note: This will not work if you add it to the bottom of the functions file. It must be added right below the Genesis Changes code.