I've tried with 2 other computer and still the same thing.
Anyway, that's absolutely not normal to try to use with other computer, restart the computer many times, IT SHOULD work right at the first time !
It's not to the customer to find a solution on this kind of problem. The unit cost 1500$ it tooks me some month to get the money.
I'm a bit disappointed of Line6 but I remain a customer of Line6. I have a JTV59, L2T, POD PRO, POD PRO BASS, POD HD500 and Relay G30, I never get such problem with those material.
My seller has sent me another unit to exchange, hope it will be Ok this time ...