Actually I have MPB17 and probably will be banned, but still want to try my luck:
I bought i-tec ExpressCard for USB3, installed kext, and also have inateck USB 3.0 hub.
ExpressCard works, even with USB2 hub, but not with USB3 hub (which also works being installed onto USB2 port).
What kind of problem could it be? Should I just try to use other USB3 hub?