I have the same issue. I bought another and that has the same problem too. Everytime i start PineAP it just crashes the Pineapple and I have to reboot it. it doesn't seem to be very good. I am sure it has worked once.; Is there something that needs to be added to the settings ? i have tried using the pineapple mac as the source and ff:ff:ff:ff:ff:ff as the target and that makes no difference. Is there a guide anywhere to follow so I can check I am setting it up correctly, does anyone know please ?