Chaining a second MR816

Hi AlakaLazlo (or anyone who may be able to help),

I too have an 816CSX and an 816X. I’ve daisy-chained them via firewire (exactly as described in the manual) but the 2nd unit refuses to pass audio out to any DAW. Each unit is working fine on it’s own and I can see all 32 ins and outs in both my mac audio/midi setup as well as in the DAWs (I’ve tried this w/ Pro Tools, Reaper, Garageband AND Tracks Live).

I’m running the most recent version of Tools for MR (V1.7.8).

I’ve tried different FW cables and just today went out & bought an optical cable (in case that was the problem) but nothing seems to help.

Any ideas where I’m going wrong?

Cheers from Australia.

MacBook Pro (13-inch, Mid 2012)
OSX 10.11.6
2.9 GHz Intel Core i7
12 GB 1600 MHz DDR3