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Wow, I've never heard of an error like that before. That cable looks looks exactly like ones I've seen in the past (besides the test equipment solutions sticker on it). I think those cables are obsolete now and they have moved to GPIB-USB-HS+, which look a little different, but nothing about that pictures tells me it is a counterfeit.
I tried entering the serial number of the unit in question linked in this thread to register it under my products, it was rejected. I'll follow up there.
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~ "It’s the questions that drive us.” ~~~~~~~~~~~~~~~~~~~~~~~~~~