diff --git a/_mb/mailbox_user__b b/_mb/mailbox_user__b
new file mode 100644
index 0000000000..009c77d26b
Binary files /dev/null and b/_mb/mailbox_user__b differ
diff --git a/akka-actor/src/main/scala/akka/routing/Routing.scala b/akka-actor/src/main/scala/akka/routing/Routing.scala
index 8fdfb8d9eb..d96f9cb5f1 100644
--- a/akka-actor/src/main/scala/akka/routing/Routing.scala
+++ b/akka-actor/src/main/scala/akka/routing/Routing.scala
@@ -81,7 +81,7 @@ trait RouterConfig {
   protected def createRoutees(props: Props, context: ActorContext, nrOfInstances: Int, targets: Iterable[String]): Vector[ActorRef] = (nrOfInstances, targets) match {
     case (0, Nil) ⇒ throw new IllegalArgumentException("Insufficient information - missing configuration.")
     case (x, Nil) ⇒ (1 to x).map(_ ⇒ context.actorOf(props))(scala.collection.breakOut)
-    case (_, xs)  ⇒ Vector.empty[ActorRef] ++ xs.map(context.actorFor(_))
+    case (_, xs)  ⇒ xs.map(context.actorFor(_))(scala.collection.breakOut)
   }
 }
 
diff --git a/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala b/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
index 6634eef783..76461d82e9 100644
--- a/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
+++ b/akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala
@@ -87,7 +87,7 @@ object Pi extends App {
   // ===== Run it =====
   // ==================
   def calculate(nrOfWorkers: Int, nrOfElements: Int, nrOfMessages: Int) {
-    val system = ActorSystem()
+    val system = ActorSystem("PiSystem")
 
     // this latch is only plumbing to know when the calculation is completed
     val latch = new CountDownLatch(1)