The test for the active abdev-portfolio plugin is not working when using the theme on a wordpress-multisite configuration.
current_user_can( 'manage_options' ) && !in_array( 'abdev-portfolio/abdev-portfolio.php', get_option( 'active_plugins') )
This test should be replaced with the following code to enable multisite-support:
current_user_can( ‘manage_options’ ) && (!in_array( $url, get_option( ‘active_plugins’) ) || !array_key_exists($url, get_site_option(‘active_sitewide_plugins’)));