Thanks for your reply. Its a brand new pineapple so its got all the latest firmware on it. I am running BT5 r3. I like what you said about the drivers for the USB device. It come bundled with a CD containing drivers. Downside is, airs have no CD drive! I read somethings on the web which say mountain lion come pre installed with all the drivers. But you need to set up internet sharing. Unfortunately it won't allow me to since it won't recognise the device! My guess is, the mac doesn't like the adaptor.