diff --git a/lib/Slic3r/GUI/Plater/2D.pm b/lib/Slic3r/GUI/Plater/2D.pm
index 83c2a5021..88a05c292 100644
--- a/lib/Slic3r/GUI/Plater/2D.pm
+++ b/lib/Slic3r/GUI/Plater/2D.pm
@@ -233,7 +233,6 @@ sub mouse_event {
     } elsif ($event->LeftUp) {
         if ($self->{drag_object}) {
             $self->{on_instances_moved}->();
-            Slic3r::GUI::_3DScene::reset_current_canvas();            
         }
         $self->{drag_start_pos} = undef;
         $self->{drag_object} = undef;
diff --git a/lib/Slic3r/GUI/Plater/3DPreview.pm b/lib/Slic3r/GUI/Plater/3DPreview.pm
index 9ed2374ec..c7dab869f 100644
--- a/lib/Slic3r/GUI/Plater/3DPreview.pm
+++ b/lib/Slic3r/GUI/Plater/3DPreview.pm
@@ -279,6 +279,7 @@ sub reload_print {
     my ($self, $force) = @_;
 
     Slic3r::GUI::_3DScene::reset_volumes($self->canvas);
+    Slic3r::GUI::_3DScene::reset_current_canvas();            
     $self->_loaded(0);
 
     if (! $self->IsShown && ! $force) {
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 8300fdbed..a9763a824 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -101,7 +101,12 @@ sub export_gcode {
                 die "The configured post-processing script is not executable: check permissions. ($script)\n";
             }
             if ($^O eq 'MSWin32' && $script =~ /\.[pP][lL]/) {
-                system($^X, $script, $output_file);
+                # The current process (^X) may be slic3r.exe or slic3r-console.exe.
+                # Replace it with the current perl interpreter.
+                my($filename, $directories, $suffix) = fileparse($^X);
+                $filename =~ s/^slic3r.*$/perl5\.24\.0\.exe/;
+                my $interpreter = $directories . $filename;
+                system($interpreter, $script, $output_file);
             } else {
                 system($script, $output_file);
             }
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index f5db97731..2148579e8 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -2376,7 +2376,7 @@ void GLCanvas3D::load_gcode_preview(const GCodePreviewData& preview_data, const
     if ((m_canvas != nullptr) && (m_print != nullptr))
     {
         // ensures that this canvas is current
-        if (!_3DScene::set_current(m_canvas, false))
+        if (!_3DScene::set_current(m_canvas, true))
             return;
 
         if (m_volumes.empty())