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Changes between Initial Version and Version 1 of Ticket #29505, comment 6

-                      initial
+                      v1
     function plugin_activated(){
+        $bgs = 'a:1:{i:0;s:93:"http://192.168.1.175/delta/wp4.0rc/wp-content/plugins/lock-it- up/templates/img/bg/default.jpg";}';
         $users = get_users( array( 'fields' => array( 'ID' ) ) );
         foreach($users as $user){
             delete_user_option($user->ID, 'wp-lock-bg-solid');
             delete_user_option($user->ID, 'wp-lock-bg');
+            update_user_option( $user->ID, 'wp-lock-bg', serialize($bgs));
+        }
+    }