So I've tried with the Kobo via a USB hub, and it makes no difference. I've also cleared out all references to Kobo in USB devices in Device Manager and tried USBDeview - which shows no Kobo devices.
I've seen suggestions that factory resetting can help, but if I do that I risk being left with a device with no books on it, and no way of restoring the library. At least at the moment I can continue to read through what I've got!
Any other ideas, anyone?
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