Tektelic Pico gateway fails to receive responses

We are trying out a Tektelic Pico gateway with Loraserver. From the raw frame log the server is receiving and responding to packets but the gateway never receives the response.
Same issue with the very latest Loraserver (app server and gateway bridge), just installed, and the previous version, running on two different machines.
It could of course be a Pico gateway problem, particularly as other gateways are ok.
However strange thing is that a much older version of Loraserver, running on yet another machine, works fine!

Any suggestions as to possible cause or for diagnostics?

Unfortunately all the Pico gateway itself can provide is a front panel led that indicates an outgoing (to server) and incoming packet (from server)!!


This is a bug in the gateway firmware:


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