Some USB hubs are cheaply designed and/or cheaply made, the hub may not meet 100% of the USB standards, or may only comply with a deprecated or incomplete version of the USB spec.
I've also seen cases where some devices will work when plugged into USB 3, but not when plugged into USB 2. Not devices that require the extra speed, note. In my case, it seems to be something in the EHCI stack in Linux, on this particular Intel motherboard, with this particular FTDI cable, whether plugged into a hub or not. Still, works with a USB 3 port, and I've got plenty, so, meh.
Not saying that's a problem with this particular device on this particular Mac, but it's something worth checking: if you have USB 2 and USB 3 ports, try both.
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