Hi,
The red link status is a known issue, logged in our database, and does not affect audio.
The DX168 patch is as expected: ‘DX Expander inputs will appear as inputs 65-96 (DX1) and 97-128 (DX2) on the GX link / SLink’. This is due to the architecture of GX/DX which is based around blocks of 32 channels, with two of these blocks ‘reserved’ for the GX4816 local I/O. For more details, have a look at page 18 here: https://www.allen-heath.com/media/DX-GX-System-Guide-ISS_4.pdf