So I have a blackmacbook, a slim new apple keyboard, and a logitech mx air, so i have a hub attatched to my macbook which includes an external hd, so here's the problem, sometimes when i plug my hub into one of my usb's it everything but the keyboard registers aka i cant type using the external keyboard....so i have to eject the external hd and then move the hub to the other usb and everything works....what is the deal!!!!!