Index: src/wp-admin/includes/screen.php
===================================================================
--- src/wp-admin/includes/screen.php	(revision 35983)
+++ src/wp-admin/includes/screen.php	(working copy)
@@ -57,7 +57,7 @@
 
 	$hidden = get_user_option( 'manage' . $screen->id . 'columnshidden' );
 
-	if ( ! $hidden ) {
+	if ( false === $hidden ) {
 		$hidden = array();
 
 		/**