(In reply to Takashi Iwai from comment #11) > If only NI box is connected to the hub, and only the hub is connected to the > machine, the bug still happens? Just for narrowing down the condition. If only the Thunderbolt box is connected, there are at least the internal devices of the box itself connected, too, i.e. a network adapter, a sound device and a card reader. I'll try to strip it down as much as possible.