I am sorry to hear that have had issues with USB controller on your system.
At this stage, the support for your product is offered through your computer manufacturer. I recommend checking the link below for troubleshooting assistance on your Apple computer:
Apple Support believes the usb controller is not Intel's, but if it uses the eXtensible driver it should at least appear to be one.
I'm not sure if that's good enough or not for this particular capture box to work, so I'll have to hold off on a purchase until I have more concrete information.