Did you do what i told you about Windows update and services?
Ps: DL outputs are Direct outputs from the inputs with the same numbers, so, DL 4 will not output any sound and DL12/13 will only output the signal from one side of In13. But that is another issue not related with the OP.
You have problems with the physical connections. It would need some technician to check it.
About the double channels that Garyb mentioned: it is simply because the S/Mux mode "sums" both ADAT A and ADAT B to let you have 96kHz sample rate. That means that you will only have 8 channels from the A16.
Anyway, i would expect it to work if you could hold the connection between the devices with your hands. At least to check if the red dot light turns red in the Sample Rate menu.
It would need some gymnastics, probably.
I can't advice you on that, maybe our WizzardGaryb can give us some clues on this. I never had that issue although i suppose that that is something which can happen. If you swap the cables does the click change to other port? Are you connecting the Out from one device to the In of the other? I know,...