Mine is not working either. I have "Automatically authenticate" enabled. When i press "randomize" it seems to change, wifi briefly disconnects, then reconnects but when i go to system settings the wifi/mac address remains unchanged. I have tried using the WiFispoof app while disconnected and with wifi turned off to see if it would make a difference, but the app wont work at all until connected to a network. I have also used terminal to determine the spoofed address, however the original address remains. Do you have any suggestions?