Not able to activate ArduinoBT 168

When I try to set my new ArduinoBT 168 to have it recognised by System Preferences for Bluetooth (of my MAC G5 with OS 10.5.8 or on my iMac with OS 10.6.5), I set Tools/Board/Arduino BT w. ATMega 168. I try then to set Tools/Port, but with all the options offered, the Preferences system always asks me for an access code. I go to the Preferences because I'm unable to run the "Blink" example sketch and to have the LED blinking. I have had a very good experience with ArduinoDuemilanove where everithing worked immediately. Can anyone help me? Thanks

the access code should be 12345