Unable to Switch Between Application Loops in Pyinstaller Executable

[Alexander Mountain]

Hi All,

I have a bit of a weird one here so hopefully someone can provide insight. I'm working on a python application using a 3d visualization library called open3d. I also have a separate app using the customtkinter library that displays a map of an area where there are certain structures of which I have 3d models.

How the app works when I run locally is that the customtkinter app opens up, displays the map, and the user picks a structure to view. Then the map app closes and starts up the visualizer application which displays the model. Here's that code to start up the open3d app:

```

def open_model_viewer(self):

        if self.CURRENT_STRUCTURE is None:

            pass

        else:

            runDashboardWindow(self.CURRENT_STRUCTURE, self)

def runDashboardWindow(structname, mapwindow):

    # close map application window

    mapwindow.destroy()

    # run dashboard application window

    gui.Application.instance.initialize()

    w = AppWindow(1536, 986, structename)

    # Run the event loop. This will not return until the last window is closed.

    try:

        gui.Application.instance.run()

        if w.reopen_window:

            runMapWindow()

    except Exception as e:

        print(e)

```

The user can click a button in the visualizer that terminates that app and restarts the map app whenever they want. 

Here's the method for that:

```

def _on_return_to_map(self):

        self.reopen_map = True

        self._on_menu_quit()

def _on_menu_quit(self):

        # clear temp data folders

        self.clear_temp_data()

        gui.Application.instance.quit()

```

Everything works as expected when I run locally. The logic for the visualizer app is in a module which I import into the file for the map app. I am able to successfully convert both these apps to an executable SEPARATELY. The visualizer works fine if I use it as the entry point for pyinstaller. When I use the map as the entry point for the executable the map app works fine but when I select a model the map app just closes without opening the visualizer at all. There's also no apparent error messages or any way to tell what went wrong. 

So my questions are as follows:

1) Does anyone know why this might be happening and how I can convert to .exe so that the visualizer successfully opens and I can freely switch between map and visualizer?

2) Is there any way for me to see any error messages related to such an issue? Calling pyinstaller with the --windowed flag and running the .exe from CLI doesn't help.

Happy to provide more info if needed.

Thanks,

Alex