I wish i could help on this one, but i am clueless about mac's and their settings.
Im running Windows Vista on my Tablet PC...(which i tether thru ICS pan)
P.S. I also tether to my Nokia N810 but i dont need the reg Fix for that one, only the btdun cab.
This Fix primarly works on HTC Vogue w/ Sprint.
I could be wrong though...