diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 5d6d8e4a6..e585a6967 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -67,6 +67,10 @@ our $medium_font = Wx::SystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
 $medium_font->SetPointSize(12);
 our $grey = Wx::Colour->new(200,200,200);
 
+# Events to be sent from a C++ menu implementation:
+# 1) To inform about a change of the application language.
+our $LANGUAGE_CHANGE_EVENT    = Wx::NewEventType;
+
 sub OnInit {
     my ($self) = @_;
     
@@ -80,6 +84,7 @@ sub OnInit {
     # Mac: "~/Library/Application Support/Slic3r"
     Slic3r::set_data_dir($datadir || Wx::StandardPaths::Get->GetUserDataDir);
     Slic3r::GUI::set_wxapp($self);
+    Slic3r::GUI::load_language();
     
     $self->{notifier} = Slic3r::GUI::Notifier->new;
     $self->{app_config} = Slic3r::GUI::AppConfig->new;
@@ -114,10 +119,12 @@ sub OnInit {
         # If set, the "Controller" tab for the control of the printer over serial line and the serial port settings are hidden.
         no_controller   => $self->{app_config}->get('no_controller'),
         no_plater       => $no_plater,
+        lang_ch_event   => $LANGUAGE_CHANGE_EVENT,
     );
     $self->SetTopWindow($frame);
 
-    EVT_IDLE($frame, sub {
+    #EVT_IDLE($frame, sub {
+    EVT_IDLE($self->{mainframe}, sub {
         while (my $cb = shift @cb) {
             $cb->();
         }
@@ -132,10 +139,43 @@ sub OnInit {
             $self->{mainframe}->config_wizard(1);
         });
     }
+
+    # The following event is emited by the C++ menu implementation of application language change.
+    EVT_COMMAND($self, -1, $LANGUAGE_CHANGE_EVENT, sub{
+        $self->recreate_GUI;
+    });
     
     return 1;
 }
 
+sub recreate_GUI{
+    my ($self) = @_;
+    print "Inside recreate_GUI \n";
+    my $topwindow = $self->GetTopWindow();
+    $self->{mainframe} = my $frame = Slic3r::GUI::MainFrame->new(
+        # If set, the "Controller" tab for the control of the printer over serial line and the serial port settings are hidden.
+        no_controller   => $self->{app_config}->get('no_controller'),
+        no_plater       => $no_plater,
+        lang_ch_event   => $LANGUAGE_CHANGE_EVENT,
+    );
+
+    if($topwindow)
+    {
+        $self->SetTopWindow($frame);
+        $topwindow->Destroy;
+    }
+
+    my $run_wizard = 1 if $self->{preset_bundle}->has_defauls_only;
+    if ($run_wizard) {
+        # On OSX the UI was not initialized correctly if the wizard was called
+        # before the UI was up and running.
+        $self->CallAfter(sub {
+            # Run the config wizard, don't offer the "reset user profile" checkbox.
+            $self->{mainframe}->config_wizard(1);
+        });
+    }
+}
+
 sub about {
     my ($self) = @_;
     my $about = Slic3r::GUI::AboutDialog->new(undef);
diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index 9f47b8d3e..4ca456338 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -47,6 +47,7 @@ sub new {
     $self->{no_controller} = $params{no_controller};
     $self->{no_plater} = $params{no_plater};
     $self->{loaded} = 0;
+    $self->{lang_ch_event} = $params{lang_ch_event};
     
     # initialize tabpanel and menubar
     $self->_init_tabpanel;
@@ -146,21 +147,23 @@ sub _init_tabpanel {
         if ($self->{plater}) {
             # Update preset combo boxes (Print settings, Filament, Printer) from their respective tabs.
             my $presets = $tab->get_presets;
-            my $reload_dependent_tabs = $tab->get_dependent_tabs;
-            $self->{plater}->update_presets($tab_name, $reload_dependent_tabs, $presets);
-            if ($tab_name eq 'printer') {
-                # Printer selected at the Printer tab, update "compatible" marks at the print and filament selectors.
-                for my $tab_name_other (qw(print filament)) {
-                    # If the printer tells us that the print or filament preset has been switched or invalidated,
-                    # refresh the print or filament tab page. Otherwise just refresh the combo box.
-                    my $update_action = ($reload_dependent_tabs && (first { $_ eq $tab_name_other } (@{$reload_dependent_tabs}))) 
-                        ? 'load_current_preset' : 'update_tab_ui';
-                    $self->{options_tabs}{$tab_name_other}->$update_action;
+            if (defined $presets){
+                my $reload_dependent_tabs = $tab->get_dependent_tabs;
+                $self->{plater}->update_presets($tab_name, $reload_dependent_tabs, $presets);
+                if ($tab_name eq 'printer') {
+                    # Printer selected at the Printer tab, update "compatible" marks at the print and filament selectors.
+                    for my $tab_name_other (qw(print filament)) {
+                        # If the printer tells us that the print or filament preset has been switched or invalidated,
+                        # refresh the print or filament tab page. Otherwise just refresh the combo box.
+                        my $update_action = ($reload_dependent_tabs && (first { $_ eq $tab_name_other } (@{$reload_dependent_tabs}))) 
+                            ? 'load_current_preset' : 'update_tab_ui';
+                        $self->{options_tabs}{$tab_name_other}->$update_action;
+                    }
+                    # Update the controller printers.
+                    $self->{controller}->update_presets($presets) if $self->{controller};
                 }
-                # Update the controller printers.
-                $self->{controller}->update_presets($presets) if $self->{controller};
+                $self->{plater}->on_config_change($tab->get_config);
             }
-            $self->{plater}->on_config_change($tab->get_config);
         }
     });
     # The following event is emited by the C++ Tab implementation ,
@@ -413,7 +416,7 @@ sub _init_menubar {
         # Add an optional debug menu 
         # (Select application language from the list of installed languages)
         # In production code, the add_debug_menu() call should do nothing.
-        Slic3r::GUI::add_debug_menu($menubar);
+        Slic3r::GUI::add_debug_menu($menubar, $self->{lang_ch_event});
         $menubar->Append($helpMenu, "&Help");
         $self->SetMenuBar($menubar);
     }
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 8063c98fd..3b825ad92 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -166,6 +166,8 @@ wxApp       *g_wxApp        = nullptr;
 wxFrame     *g_wxMainFrame  = nullptr;
 wxNotebook  *g_wxTabPanel   = nullptr;
 
+std::vector<Tab *> g_tabs_list;
+
 wxLocale*		m_Locale;
 std::string		m_local_dir;
 
@@ -184,6 +186,26 @@ void set_tab_panel(wxNotebook *tab_panel)
     g_wxTabPanel = tab_panel;
 }
 
+std::vector<Tab *>& get_tabs_list()
+{
+	return g_tabs_list;
+}
+
+bool checked_tab(Tab* tab)
+{
+	bool ret = true;
+	if (find(g_tabs_list.begin(), g_tabs_list.end(), tab) == g_tabs_list.end())
+		ret = false;
+	return ret;
+}
+
+void delete_tab_from_list(Tab* tab)
+{
+	std::vector<Tab *>::iterator itr = find(g_tabs_list.begin(), g_tabs_list.end(), tab);
+	if (itr != g_tabs_list.end())
+		g_tabs_list.erase(itr);
+}
+
 bool select_language(wxArrayString & names,
 	wxArrayLong & identifiers)
 {
@@ -214,10 +236,10 @@ bool load_language()
 	long language;
 // 	if (!config.Read(wxT("wxTranslation_Language"),
 // 		&language, wxLANGUAGE_UNKNOWN))
-// 	{
-		language = wxLANGUAGE_UKRAINIAN;// wxLANGUAGE_UNKNOWN;
-// 	}
-// 	if (language == wxLANGUAGE_UNKNOWN) return false;
+	{
+		language = wxLANGUAGE_ENGLISH_US;// wxLANGUAGE_UKRAINIAN;// wxLANGUAGE_UNKNOWN;
+	}
+	if (language == wxLANGUAGE_UNKNOWN) return false;
 	wxArrayString names;
 	wxArrayLong identifiers;
 	get_installed_languages(names, identifiers);
@@ -287,16 +309,22 @@ void get_installed_languages(wxArrayString & names,
 	}
 }
 
-void add_debug_menu(wxMenuBar *menu)
+void add_debug_menu(wxMenuBar *menu, int event_language_change)
 {
 //#if 0
     auto local_menu = new wxMenu();
 	local_menu->Append(wxWindow::NewControlId(1), _L("Change Application Language"));
-	local_menu->Bind(wxEVT_MENU, [](wxEvent&){
+	local_menu->Bind(wxEVT_MENU, [event_language_change](wxEvent&){
 		wxArrayString names;
 		wxArrayLong identifiers;
 		get_installed_languages(names, identifiers);
-		select_language(names, identifiers);
+		if (select_language(names, identifiers)){
+			show_info(g_wxTabPanel, "Application will be restarted", "Attention!");
+			if (event_language_change > 0) {
+				wxCommandEvent event(event_language_change);
+				g_wxApp->ProcessEvent(event);
+			}
+		}
 	});
 	menu->Append(local_menu, _T("&Localization"));
 //#endif
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index c8f156846..d3db707fa 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -58,7 +58,7 @@ void set_wxapp(wxApp *app);
 void set_main_frame(wxFrame *main_frame);
 void set_tab_panel(wxNotebook *tab_panel);
 
-void add_debug_menu(wxMenuBar *menu);
+void add_debug_menu(wxMenuBar *menu, int event_language_change);
 // Create a new preset tab (print, filament and printer),
 void create_preset_tabs(PresetBundle *preset_bundle, AppConfig *app_config, 
 						bool no_controller, bool is_disabled_button_browse,	bool is_user_agent,
@@ -83,6 +83,10 @@ void get_installed_languages(wxArrayString & names, wxArrayLong & identifiers);
 // select language from the list of installed languages
 bool select_language(wxArrayString & names, wxArrayLong & identifiers);
 
+std::vector<Tab *>& get_tabs_list();
+bool checked_tab(Tab* tab);
+void delete_tab_from_list(Tab* tab);
+
 } }
 
 #endif
diff --git a/xs/src/slic3r/GUI/Tab.cpp b/xs/src/slic3r/GUI/Tab.cpp
index 77c441005..904842a5e 100644
--- a/xs/src/slic3r/GUI/Tab.cpp
+++ b/xs/src/slic3r/GUI/Tab.cpp
@@ -1238,7 +1238,7 @@ void TabPrinter::build_extruder_pages(){
 	// # rebuild page list
 	PageShp page_note = m_pages.back();
 	m_pages.pop_back();
-	while (m_pages.back()->title().find("Extruder") != std::string::npos)
+	while (m_pages.back()->title().find(_L("Extruder")) != std::string::npos)
 		m_pages.pop_back();
 	for (auto page_extruder : m_extruder_pages)
 		m_pages.push_back(page_extruder);
@@ -1361,6 +1361,9 @@ void Tab::load_current_preset()
 	// preset dirty again
 	// (not sure this is true anymore now that update_dirty is idempotent)
 	wxTheApp->CallAfter([this]{
+		// checking out if this Tab exists till this moment
+		if (!checked_tab(this))
+			return;
 		update_tab_ui();
 		on_presets_changed();
 	});
diff --git a/xs/src/slic3r/GUI/Tab.hpp b/xs/src/slic3r/GUI/Tab.hpp
index 2b030f4da..4f3a15736 100644
--- a/xs/src/slic3r/GUI/Tab.hpp
+++ b/xs/src/slic3r/GUI/Tab.hpp
@@ -112,11 +112,12 @@ public:
 
 public:
 	Tab() {}
-	Tab(wxNotebook* parent, const char *title, const char* name, bool no_controller) : 
+	Tab(wxNotebook* parent, wxString title, const char* name, bool no_controller) : 
 		m_parent(parent), m_title(title), m_name(name), m_no_controller(no_controller) {
 		Create(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxBK_LEFT | wxTAB_TRAVERSAL);
+		get_tabs_list().push_back(this);
 	}
-	~Tab(){}
+	~Tab() { delete_tab_from_list(this); }
 
 	wxWindow*	parent() const { return m_parent; }
 	wxString	title()	 const { return m_title; }
@@ -160,7 +161,10 @@ public:
 	wxSizer*		description_line_widget(wxWindow* parent, ogStaticText** StaticText);
 	bool			current_preset_is_dirty();
 	DynamicPrintConfig*	get_config() { return m_config; }
-	PresetCollection*	get_presets() { return m_presets; }
+	PresetCollection*	get_presets()
+	{
+		return m_presets;
+	}
 	std::vector<std::string>	get_dependent_tabs() { return m_reload_dependent_tabs; }
 
 	void			on_value_change(std::string opt_key, boost::any value);
diff --git a/xs/src/slic3r/GUI/TabIface.cpp b/xs/src/slic3r/GUI/TabIface.cpp
index 2b897a7b9..2f3adea3c 100644
--- a/xs/src/slic3r/GUI/TabIface.cpp
+++ b/xs/src/slic3r/GUI/TabIface.cpp
@@ -13,7 +13,7 @@ bool	TabIface::current_preset_is_dirty()					{ return m_tab->current_preset_is_d
 void	TabIface::OnActivate()								{ return m_tab->OnActivate();}
 std::string					TabIface::title()				{ return m_tab->title().ToStdString();}
 DynamicPrintConfig*			TabIface::get_config()			{ return m_tab->get_config(); }
-PresetCollection*			TabIface::get_presets()			{ return m_tab->get_presets(); }
+PresetCollection*			TabIface::get_presets()			{ return m_tab!=nullptr ? m_tab->get_presets() : nullptr; }
 std::vector<std::string>	TabIface::get_dependent_tabs()	{ return m_tab->get_dependent_tabs(); }
 
 }; // namespace Slic3r
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index c273013db..8f6b6ee68 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -32,8 +32,8 @@ void set_main_frame(SV *ui)
 void set_tab_panel(SV *ui)
     %code%{ Slic3r::GUI::set_tab_panel((wxNotebook*)wxPli_sv_2_object(aTHX_ ui, "Wx::Notebook")); %};
 
-void add_debug_menu(SV *ui)
-    %code%{ Slic3r::GUI::add_debug_menu((wxMenuBar*)wxPli_sv_2_object(aTHX_ ui, "Wx::MenuBar")); %};
+void add_debug_menu(SV *ui, int event_language_change)
+    %code%{ Slic3r::GUI::add_debug_menu((wxMenuBar*)wxPli_sv_2_object(aTHX_ ui, "Wx::MenuBar"), event_language_change); %};
 
 void create_preset_tabs(PresetBundle *preset_bundle, AppConfig *app_config, 
                         bool no_controller, bool is_disabled_button_browse, bool is_user_agent,
@@ -46,3 +46,6 @@ void create_preset_tabs(PresetBundle *preset_bundle, AppConfig *app_config,
 
 Ref<TabIface> get_preset_tab(char *name)
     %code%{ RETVAL=Slic3r::GUI::get_preset_tab_iface(name); %};
+
+bool load_language()
+    %code%{ RETVAL=Slic3r::GUI::load_language(); %};