I've got mine plugged into a hub (Dynex), powered, not on the keyboard. I am using an older imac and works fine. If something doesn't work using a hub I use the keyboard which seems to work as plugging directly into my machine, my ipods are one thing I need to use the keyboard for.
So get a powered hub and off you go....Read Tom's warning about usb 2 and 3 ....
"Mister I ain't a boy no I'm a man
And I believe in a promised land"....