Hello,

I've been trying to solve a problem for quite some time now with the ADAT connection of my Fireface 400. I have 6 different synths-drumboxes, MIDI synchronized with a MOTU MIDI Express XT and cabled to the 16 analog inputs of the Fireface and an Octopre MKII preamp from Focurite (digitally connected to the FF400). In stand alone mode (= only using Totalmix) everything works perfectly. But wether I choose the "all channels" option or the "analog" option in the settings of the FF400, all the inputs are still available and fonctionning. Only the ADAT outputs disappear in Totalmix in the "analog" mode. Firstly, is that normal ? I can't remember and I'm not sure of the response found in the last manual of the Fireface...
Secondly, I can only be in "analog" mode in Pro Tools (everything's ok in that mode). But if I change the settings to "all channels", restart the computer and open Pro Tools, firewire errors appear at the launch of PT in the settings dialog box of the FF400 and the sequencer will close, crash or turn forever without opening a session... I don't understand why... The ADAT led on the frontpanel of the FF400 is continuously green, ADAT input status indicates "Sync" in the settings dialog. The Octopre is at the good sample rate, receives Wordclock and is locked. I had been using the two of them for 4 or 5 years without any problem before now...

I've already tried a few things : change the buffer size of the FF400, change the firewire  connection (Texas Instrument) by installing a new bracket (I haven't changed the ADAT and firewire cables yet, they are still those delivered with the soundcard), check the settings in PT, check for updates...
I'm getting a bit confused now and don't know where to look anymore. Needless to say any help would be very much appreciated !! 

Here's my configuration for those who have the time to answer :

* RME Fireface 400 : driver date : 15.12.16 ; driver version : 3.122 ; hardware revision : 1.71 ; Totalmix version : 1.40 ; MMCSS for Asio enabled.
Buffer size : 256 samples
Word : single speed
Optical : ADAT
SPDIF : Consumer (no Emphasis)
SPDIF input (unused): coaxial (no TMS)
WDM Devices : 1
Sample rate : 48kHz
Clock source : Internal
Pitch : 0%
Input status : for Word+SPDIF+LTC= No Lock ; for ADAT=Sync

* Focusrite Octopre MKII : Sample rate=48kHz ; Wordclock : received ; Locked (with the RME FF400)

* MOTU MIDI Express XT

* Pro Tools : 12.8.0 (I already had the problem in PT11)

* Computer :
Windows 7 64 bits Integral SP-1
Motherboard : Gigabyte H67A-UD3H-B3
RAM : 20 Go
CPU : I5 2500K @ 3,30 GHz
HDD : 1 SSD 238 GB for the system + 2 WD 1 To
Firewire bracket : compatible OHCI 1394 Texas Instruments.

Thanks in advance for your answers !
S23.