It's definitely a bug, and it lasts from many years.
I had exactly the same issue, open several tickets and solved nothing. There's something on the old forums, too much irritating to search.
Line6 support kept saying to reflash the firmware, and it seemed that my 'DOESN'T CONNECT TO ANYTHING' has not been clear enough.
Hope for you your hardware is new and you can have it replaced, otherwise you can simply throw it away. They ask me the same money to fix it or to buy a new unit (I live in Italy).
By the way, it's NOT a Windows issue, I get exactly the same with OSx.
Very very poor support for this piece of hardware, and very poor firmware.
Sorry