I first tried connecting the Cybook through an external hub, connected directly to the computer, in form of an additional panel on the front side of the computer. It showed unknown device for the Cybook and unknown device for the card. After a few tries it started showing them as mass storage, and correctly assigned drive letters, but access to them was still impossible.
At that point I connected the Cybook to USB 2.0 slot directly in the mainboard, and found that it always works ok in this slot.
For you, it may be the problem with the device - it may require the behavior that is not in the standard, but simple USB ports have it. Or it may be the problem with the hub - the device may require USB standard feature the your hub doesn't have, and your other devices don't need. Just because other devices work with the hub it doesn't mean it's fully USB compatible.
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