I have two ports on my laptop running Windows 8.1 - USB 2.0 port and USB 3.0 port.
Both ports recognize the USB 3.0 hub when attached to the laptop.
However, when I tether my cell phone to the USB 3.0 hub and connect to the USB 3.0 port on my laptop. My laptop shows USB device not recognized. cellphone --> USB 3.0 hub --> USB 3.0 port (device not recognized)
However, when I tether my cell phone to the USB 3.0 hub and connect to the USB 2.0 port on my laptop. Tethering works. cellphone --> USB 3.0 hub --> USB 2.0 port (device is recognized, and works fine)
All other devices attached to the USB 3.0 hub like mouse, external harddisk, pendrives attached to USB 3.0 or USB 2.0 ports work fine as desired.
Issue is just with cell phone tethered to USB 3 port through a USB 3 hub.