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Bob, I had the same problem a few months back.
If you plug a USB 1.1 device in a USB 2.0 hub, all other ports on the hub no longer work as USB 2.0
So check what speed the devices are, you may have a USB 1.1 amongst them.
The same goes for the hub if it is USB 1.1 it will slow the other ports on the computer.
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