I don't have a USB 2 hub. Will need to buy one...Are there USB3 hubs?
Yes, but that was part of my problem. I "upgraded" all my peripherals to USB 3 -- the hub, the card readers, the Voyager drive bay -- and everything works fine, except I could not get my NEC sensor puck to work. It drove me crazy, and the NEC tech finally figured out that I was using USB 3 and it's not really backward compatible with everything.
Luckily I had not tossed my old USB 2 hub. So when I need to recalibrate my monitor each month, I attach the USB 2 hub, hook up the sensor puck, and it works.
I'm not at all certain that this will fix your problem, of course. But good luck with it.