diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index c8a5b274f..03b42cfe5 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -130,13 +130,7 @@ void AppConfig::set_defaults()
 #endif
 
         if (get("single_instance").empty())
-            set_bool("single_instance",
-#ifdef __APPLE__
-                true
-#else // __APPLE__
-                false
-#endif // __APPLE__
-                );
+            set_bool("single_instance", false);
 
 #ifdef SUPPORT_REMEMBER_OUTPUT_PATH
         if (get("remember_output_path").empty())
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 5c04befe9..70c2efccb 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -4483,6 +4483,12 @@ void GUI_App::OSXStoreOpenFiles(const wxArrayString &fileNames)
 // wxWidgets override to get an event on open files.
 void GUI_App::MacOpenFiles(const wxArrayString &fileNames)
 {
+    if (m_post_initialized) {
+        std::vector<wxString> names;
+        for (auto & n : fileNames) names.push_back(n);
+        start_new_slicer(names);
+        return;
+    }
     std::vector<std::string> files;
     std::vector<wxString>    gcode_files;
     std::vector<wxString>    non_gcode_files;
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index a72d36569..3b1e1708c 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -84,19 +84,18 @@ class BambuStudioTaskBarIcon : public wxTaskBarIcon
 {
 public:
     BambuStudioTaskBarIcon(wxTaskBarIconType iconType = wxTBI_DEFAULT_TYPE) : wxTaskBarIcon(iconType) {}
-    //wxMenu *CreatePopupMenu() override {
-        //wxMenu *menu = new wxMenu;
-        //BBS do not support multi instances in mac
-        //if(wxGetApp().app_config->get("single_instance") == "0") {
-        //    // Only allow opening a new PrusaSlicer instance on OSX if "single_instance" is disabled,
-        //    // as starting new instances would interfere with the locking mechanism of "single_instance" support.
-        //    append_menu_item(menu, wxID_ANY, _L("Open new instance"), _L("Open a new PrusaSlicer instance"),
-        //    [](wxCommandEvent&) { start_new_slicer(); }, "", nullptr);
+    wxMenu *CreatePopupMenu() override {
+        wxMenu *menu = new wxMenu;
+        //if (wxGetApp().app_config->get("single_instance") == "false") {
+            // Only allow opening a new PrusaSlicer instance on OSX if "single_instance" is disabled,
+            // as starting new instances would interfere with the locking mechanism of "single_instance" support.
+            append_menu_item(menu, wxID_ANY, _L("New Window"), _L("Open a new window"),
+            [](wxCommandEvent&) { start_new_slicer(); }, "", nullptr);
         //}
-        //append_menu_item(menu, wxID_ANY, _L("G-code Viewer") + dots, _L("Open G-code Viewer"),
-        //    [](wxCommandEvent&) { start_new_gcodeviewer_open_file(); }, "", nullptr);
-        //return menu;
-    //}
+//        append_menu_item(menu, wxID_ANY, _L("G-code Viewer") + dots, _L("Open G-code Viewer"),
+//            [](wxCommandEvent&) { start_new_gcodeviewer_open_file(); }, "", nullptr);
+        return menu;
+    }
 };
 /*class GCodeViewerTaskBarIcon : public wxTaskBarIcon
 {
@@ -1680,6 +1679,12 @@ void MainFrame::init_menubar_as_editor()
     // File menu
     wxMenu* fileMenu = new wxMenu;
     {
+#ifdef __APPLE__
+        // New Window
+        append_menu_item(fileMenu, wxID_ANY, _L("New Window") + "\tCtrl+N", _L("Start a new window"),
+                         [](wxCommandEvent&) { start_new_slicer(); }, "", nullptr,
+                         []{ return true; }, this);
+#endif
         // New Project
         append_menu_item(fileMenu, wxID_ANY, _L("New Project") + "\tCtrl+N", _L("Start a new project"),
             [this](wxCommandEvent&) { if (m_plater) m_plater->new_project(); }, "", nullptr,
diff --git a/src/slic3r/Utils/MacDarkMode.mm b/src/slic3r/Utils/MacDarkMode.mm
index e28067fc1..5750358dd 100644
--- a/src/slic3r/Utils/MacDarkMode.mm
+++ b/src/slic3r/Utils/MacDarkMode.mm
@@ -286,7 +286,7 @@ namespace GUI {
 
 void initGestures(void * view,  wxEvtHandler * handler)
 {
-    NSOpenGLView * glView = (NSOpenGLView *) view;
+    wxNSCustomOpenGLView * glView = (wxNSCustomOpenGLView *) view;
     [glView initGesturesWithHandler: handler];
 }
 
diff --git a/src/slic3r/Utils/Process.cpp b/src/slic3r/Utils/Process.cpp
index fdd922c00..c25910574 100644
--- a/src/slic3r/Utils/Process.cpp
+++ b/src/slic3r/Utils/Process.cpp
@@ -60,17 +60,19 @@ static void start_new_slicer_or_gcodeviewer(const NewSlicerInstanceType instance
 	boost::filesystem::path bin_path = into_path(wxStandardPaths::Get().GetExecutablePath());
 #if defined(__APPLE__)
 	{
-		bin_path = bin_path.parent_path() / "BambuStudio";
+		//bin_path = bin_path.parent_path() / "BambuStudio";
+        bin_path = "/usr/bin/open";
 		// On Apple the wxExecute fails, thus we use boost::process instead.
 		BOOST_LOG_TRIVIAL(info) << "Trying to spawn a new slicer \"" << bin_path.string() << "\"";
 		try {
-			std::vector<std::string> args;
+            std::vector<std::string> args = { "-n", "-a", "BambuStudio"};
+            if (!paths_to_open.empty()) {
+                for (const auto& file : paths_to_open)
+                    args.emplace_back(into_u8(file));
+            }
+            args.emplace_back("--args");
 			if (instance_type == NewSlicerInstanceType::GCodeViewer)
 				args.emplace_back("--gcodeviewer");
-			if (!paths_to_open.empty()) {
-				for (const auto& file : paths_to_open)
-					args.emplace_back(into_u8(file));
-			}
 			if (instance_type == NewSlicerInstanceType::Slicer && single_instance)
 				args.emplace_back("--single-instance");
 			boost::process::spawn(bin_path, args);