Help: Ian Canada flagship streamer not working

I have recently purchased a series of Ian Canada products, to build a flagship streamer for my non-oversampling DAC (LAB12 DAC1+). The streamer consists of:
  • StationPi Pro
  • LinearPi Dual
  • Salas L-Adapter
  • 3 UCConditioner MkII boards
  • FIFOPi Q7
  • TransportPiAES
I have put (almost) everything together, apart from the 3 ultracapacitor boards, which will be placed and connected after a few days.

I am using Gentooplayer with Logitech Media Server, Squeezelite and Qobuz.

Although the system works fine, when streaming directly from the Rpi4 USB port (positioned on the StationPi Pro board), the IAN Canada stack does not send music to the DAC, when the TransportPiAES is connected via the SPDIF coaxial cable to the DAC. All lights of the various Ian Canada cards light up as expected, and the streamer 'locks' fine with the DAC, when the SPDIF cable is connected (see photo with arrows).

Initially I used the 'IanFifoII' DAC in GentooPlayer. But I have also tried other DAC options, but without success. I am not sure whether I have a hardware (FifoPi Q7? TransportPiAES?) or software problem (GentooPlayer?).

Does anyone have any suggestions about what might be wrong and what I should test?

Thanks in advance for the support.

Panos
Athens, Greece
 

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Usually, its best to post in one of the Iancanada threads with questions like this. If there is some reason why you don't want to do that then maybe we can help. That said, it helps greatly to have a sufficient oscilloscope for troubleshooting digital audio problems.