James, I bought the Arduino from Amazon about 1.5 years ago. It had been working OK but my problems began with OS10.8. Now I do not have the USB option from the Tools>Serial Port, only Bluetooth. Arduino only installed Bluetooth options in the Tools menu. I checked my Macbook, OS10.7, and it only has Bluetooth options in the Tools>Serial Port menu, no USB. I tried Arduino versions 1.0, 1.01. and 1.0.2. My Mac and Arduino do not play well together.