diff --git a/arrow.gd b/arrow.gd
index ee1636c..91dc287 100644
--- a/arrow.gd
+++ b/arrow.gd
@@ -8,12 +8,13 @@ func _ready():
 	pass
 
 func _process(delta):
-	var t = repository.objects[target]
-	#print(t)
-	$Line.points[1] = t.global_position - global_position
-	$Label.position = ($Line.points[0] + $Line.points[1])/2
-	$Tip.position = ($Line.points[0] + $Line.points[1])/2
-	$Tip.rotation = PI+$Line.points[0].angle_to($Line.points[1])
+	if repository.objects.has(target):
+		var t = repository.objects[target]
+		#print(t)
+		$Line.points[1] = t.global_position - global_position
+		$Label.position = ($Line.points[0] + $Line.points[1])/2
+		$Tip.position = ($Line.points[0] + $Line.points[1])/2
+		$Tip.rotation = PI+$Line.points[0].angle_to($Line.points[1])
 	
 func label_set(new_label):
 	label = new_label
diff --git a/main.gd b/main.gd
index 7c17922..13f20c1 100644
--- a/main.gd
+++ b/main.gd
@@ -16,6 +16,9 @@ func _ready():
 	server = TCP_Server.new()
 	server.listen(1234)
 	
+	# Load first level.
+	load_level(0)
+	
 func list_levels():
 	var levels = []
 	var dir = Directory.new()
diff --git a/node.gd b/node.gd
index af2b908..d992295 100644
--- a/node.gd
+++ b/node.gd
@@ -14,12 +14,13 @@ func _ready():
 
 func _process(delta):
 	for c in children.keys():
-		var other = get_node("..").objects[c]
-		var d = other.position.distance_to(position)
-		var dir = (other.position - position).normalized()
-		var f = (d*0.05)
-		position += dir*f
-		other.position -= dir*f
+		if get_node("..").objects.has(c):
+			var other = get_node("..").objects[c]
+			var d = other.position.distance_to(position)
+			var dir = (other.position - position).normalized()
+			var f = (d*0.05)
+			position += dir*f
+			other.position -= dir*f
 	
 func id_set(new_id):
 	id = new_id
diff --git a/repository.gd b/repository.gd
index 5dfecc9..0867287 100644
--- a/repository.gd
+++ b/repository.gd
@@ -10,20 +10,20 @@ func _ready():
 
 func _process(delta):
 	if path:
-		update_everything()
+		apply_forces()
 		
 func update_everything():
 	update_head()
 	update_refs()
 	update_index()
 	update_objects()
-	apply_forces()
 
 func set_path(new_path):
 	path = new_path
 	for o in objects.values():
 		o.queue_free()
 	objects = {}
+	update_everything()
 	
 func get_path():
 	return path
diff --git a/repository.tscn b/repository.tscn
index 23c3be2..362af37 100644
--- a/repository.tscn
+++ b/repository.tscn
@@ -25,3 +25,14 @@ text = "Index:"
 __meta__ = {
 "_edit_use_anchors_": false
 }
+
+[node name="Button" type="Button" parent="."]
+margin_left = 36.5602
+margin_top = 67.9891
+margin_right = 94.5602
+margin_bottom = 109.989
+text = "Update"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+[connection signal="pressed" from="Button" to="." method="update_everything"]
diff --git a/terminal.gd b/terminal.gd
index b55518c..a5ea6b7 100644
--- a/terminal.gd
+++ b/terminal.gd
@@ -12,3 +12,4 @@ func run_command_in_a_thread(command):
 	$Input.text = ""
 	$Output.text = $Output.text + "$ " + command + "\n" + output
 	$Output.scroll_vertical = 999999
+	$"../ActiveRepository".update_everything()