Comment 4 for bug 1435635

Yes, I need to hit CTRL-C to return to command prompt.

No, the window is not invisible. It does not exist. And, the process is not shown in Taskmanager. Whereas, the process does show in Taskmanager when running the prior version (version from ppa release before 1.1.0). I have 1.1.0 installed now so cannot say for sure what the exact version number was before 1.1.0.

I have always used the ppa to install the application, and have allowed all updates via the ppa. Only the latest version has ever given a problem.

Here is the output from running "lightdm-gtk-greeter-settings-pkexec" in a terminal, including what comes after hitting CTRL-C.

prodigal@GVS:~$ lightdm-gtk-greeter-settings-pkexec

** (lightdm-gtk-greeter-settings:13008): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-L8bwu2nZ3U: Connection refused
^CTraceback (most recent call last):
  File "/usr/bin/lightdm-gtk-greeter-settings", line 33, in <module>
    lightdm_gtk_greeter_settings.main()
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/__init__.py", line 68, in main
    window = GtkGreeterSettingsWindow.GtkGreeterSettingsWindow(mode=window_mode)
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/GtkGreeterSettingsWindow.py", line 85, in __new__
    window.init_window()
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/GtkGreeterSettingsWindow.py", line 189, in init_window
    self._read()
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/GtkGreeterSettingsWindow.py", line 209, in _read
    group.read(self._config)
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/OptionGroup.py", line 109, in read
    entry.value = value if value is not None else self._defaults[key]
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/OptionEntry.py", line 72, in value
    self._set_value(value if formatted is None else formatted)
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/IndicatorsEntry.py", line 295, in _set_value
    for options in self._read_options_string(value):
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/IndicatorsEntry.py", line 350, in _read_options_string
    name, s = self._next_string_token(s, ':;')
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/IndicatorsEntry.py", line 394, in _next_string_token
    token.append(s[last: i if c in delimiters else i + 1].rstrip())
KeyboardInterrupt

Not sure if that tells you anything, but... :)