There is one more possibility. Have you checked that patch cable to make sure it has the tip connected to the tip, ring to ring and sleeve to sleeve? (The names of the 3 metal connections on the connector between the black rings) If you don't have a meter to test this, perhaps just try another cable.
It's a long shot since it's hard for me to imagine a cable being sold that's reverse-wired like that, but it's the last thing I can think of to try before we look at you returning your Proteus and/or TS for repair.
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