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For my limited understanding it may be that the driver is requesting isochronous transfer in from the device. And I f that USB server doesn't support it, then nothing is sent from the device, it just fails.
Devices can send bulk transfer and isochronous, one is error checked and isn't time critical, the latter is 'streamed' and there's no error checking(voice , audio).
Perhaps it's PHD requesting through the driver to the device to use isochronous transfer?
Have you tested it through your image capture software, nebulousity or maximDL ?
I agree that spec description was all over the shop, what the heck is forward capability?
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