diff --git a/lib/Slic3r/GUI/Tab.pm b/lib/Slic3r/GUI/Tab.pm
index 7acb503a3..d215b3777 100644
--- a/lib/Slic3r/GUI/Tab.pm
+++ b/lib/Slic3r/GUI/Tab.pm
@@ -545,7 +545,7 @@ sub on_preset_loaded {
     my $self = shift;
     
     # update the extruders count field
-    {Slic3r::debugf "nozzle count = %d\n", scalar @{ Slic3r::Config->get_raw('nozzle_diameter') };
+    {
         # set value in repository according to the number of nozzle diameters supplied
         Slic3r::Config->set('extruders_count', scalar @{ Slic3r::Config->get_raw('nozzle_diameter') });
         
diff --git a/lib/Slic3r/Polyline.pm b/lib/Slic3r/Polyline.pm
index 33aba11b9..65d9582de 100644
--- a/lib/Slic3r/Polyline.pm
+++ b/lib/Slic3r/Polyline.pm
@@ -17,7 +17,7 @@ sub new {
         $self = [ @_ ];
     }
     
-    bless $self, $class;use XXX; ZZZ $self if !defined $self->[0];
+    bless $self, $class;
     bless $_, 'Slic3r::Point' for @$self;
     $self;
 }