I have the same problem, I'm using Kali Linux 64bits as well. I noticed these lines on syslog everytime I open Connection Properties. No error on GUI.
2xclient.desktop[22186]: Object::connect: No such signal QDBusAbstractInterface:: DeviceRemoved(QDBusObjectPath)
2xclient.desktop[22186]: Object::connect: (receiver name: 'TuxConfigDrivesDlg')
2xclient.desktop[22186]: Object::connect: No such signal QDBusAbstractInterface:: DeviceChanged(QDBusObjectPath)
2xclient.desktop[22186]: Object::connect: (receiver name: 'TuxConfigDrivesDlg')
gnome-session[1014]: Window manager warning: Invalid WM_TRANSIENT_FOR window 0x140000a specified for 0x1401387 (Connection).
Maybe we are missing some kind of lib or ln?