Is it working fully with USB3 flash drives, are you getting full USB3 transfer speeds?
USB 2 works in a USB3 slot using pins 2 and 3 for data, those pins are not used for USB 3 so could be that just pin 2 or 3 is faulty.
Yep seems to be the same transfer speed as the other USB3 Ports. I have 6 USB3 ports on the back five of them are working, So i think i will just live with it rather than sending the system back, Also i have two more USB3 ports on the top of the PC case.