diff -aur pm-cb-master/lib/PM/CB/Control.pm pm-cb-master2/lib/PM/CB/Control.pm
--- pm-cb-master/lib/PM/CB/Control.pm	2019-06-08 16:07:06.000000000 -0400
+++ pm-cb-master2/lib/PM/CB/Control.pm	2019-07-10 22:40:18.000000000 -0400
@@ -15,6 +15,9 @@
 sub start_comm {
     my ($self) = @_;
     $self->{communicate_t} = $self->{worker_class}->create(sub {
+        if ($INC{'threads.pm'}) {
+            $SIG{QUIT} = sub { threads->exit };
+        }
         my $communication = PM::CB::Communication->new({
             to_gui   => $self->{to_gui},
             from_gui => $self->{to_comm},
@@ -42,9 +45,11 @@
             $self->{to_comm}->enqueue(['url']);
         };
     }
-    $self->{to_comm}->insert(0, ['quit']);
-    $self->{communicate_t}->join;
-    $self->{to_gui}->insert(0, ['quit']);
+    if ($^O ne 'MSWin32' || ! $INC{'MCE/Util.pm'}) {
+        $self->{communicate_t}->kill('QUIT');
+        $self->{communicate_t}->join;
+    }
+    $self->{to_gui}->enqueue(['quit']);
 }


diff -aur pm-cb-master/lib/PM/CB/GUI.pm pm-cb-master2/lib/PM/CB/GUI.pm
--- pm-cb-master/lib/PM/CB/GUI.pm	2019-06-08 16:07:06.000000000 -0400
+++ pm-cb-master2/lib/PM/CB/GUI.pm	2019-07-06 15:17:07.000000000 -0400
@@ -673,7 +673,7 @@
 sub quit {
     my ($self) = @_;
     print STDERR "Quitting...\n";
-    $self->{to_control}->insert(0, ['quit']);
+    $self->{to_control}->enqueue(['quit']);
 }


diff -aur pm-cb-master/pm-cb-g pm-cb-master2/pm-cb-g
--- pm-cb-master/pm-cb-g	2019-06-08 16:07:06.000000000 -0400
+++ pm-cb-master2/pm-cb-g	2019-07-06 15:11:58.000000000 -0400
@@ -55,15 +55,15 @@
 }


-use if $mce => 'MCE::Hobo';
-use if $mce => 'MCE::Shared';
+use if $mce => 'MCE::Child';
+use if $mce => 'MCE::Channel';

 use if ! $mce => threads => (stack_size => 2 ** $stack_size);
 use if ! $mce => 'Thread::Queue';

 my ($queue_class, $queue_constructor, $worker_class)
     = $mce
-    ? ('MCE::Shared', 'queue', 'MCE::Hobo')
+    ? ('MCE::Channel', 'new', 'MCE::Child')
     : ('Thread::Queue', 'new', 'threads');

 my ($to_gui, $to_comm, $to_control)