Arduino mega & maxuino do not fit?

Hello everybody, I just had an arduino mega & here is my configuration : mac os X 10.5.8 firmata 2.1 serialport : dev/cu.usbserial-a900ae0B Maxuino-007

I don't understand why I 'm stuck, i want for instance to use the PWM and it's not working... I saw the older post in oct 2009, about the problems between maxuino & arduino mega did it move since?

Thank u