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TMDSDOCK28335: Experimenter's Kit - cannot connect via USB debug port

Part Number: TMDSDOCK28335

We are using a number of Experimenter's Kits, and have had no problems with them.  The USB port can be used for both DEBUG and a serial port.

I have just got two new ones. One is OK but the other is showing no debug port and two COM ports, as the right side in the picture below below.

I have swapped the control cards between the docking stations, and the fault is with the dock.
I can see no difference between the two docks.  .

Any ideas on how to diagnose the fault and fix it?

Regards, Giles