That is probably because the hub does not provide enough power for 10 Antminer U1/U2s.
I just ordered this from Amazon:
http://www.amazon.com/GearMo%C2%AE-Port-Power-Adapter-Cable/dp/B00BZABGWK/ref=sr_1_30?ie=UTF8&qid=1400989786&sr=8-30&keywords=usb+3.0+hub+aluminum
The advantage of most USB 3.0 hubs vs the 2.0's is that they come with a 12 volt adapter. In this case a 3 amp one. So that's 36 watts total power available. Take note that I said most, I have seen some come with a 5 volt adapter. Stay away from those. Anyways, we'll see how I make out with this one.