I will be the first to admin, I am new to using Line 6 products and for the most part I am trying to follow the Line 6 instructions, which are not without there own challenges. Since the instructions don't mention Gearbox, I did a search on it.
The supported O/S does not include MAC (Again I am on the Line6 documentation) It only support Windows XP,Vista Win7 and Win8.
Tomorrow I will try it again with an old PC, to see if I have any better, Luck
Thanks for your suggestion
Cheers