Hi

My HDSPe AIO suffer from a really unstable clock on the ADAT port at 48KHz.

Here's my setup:

Rme HDSPe AIO, is my main audio card that I use for my stereo I/O, I also have the additional 4 analog I/O installed

Rme ADI-4 DD, I use it to convert the ADAT I/O from the HDSPe into AES I/O

Apogee AD8000, is connected to the ADI-4 DD using the AES I/O

The Apogee is my master clock, I send the word clock to the ADI-4 DD which has the sync set to WC.
On the HDSPe setting the clock mode is set to Autosync.

I'm using a Mac Pro 2x2.8 GHz Quad-Core Intel Xeon with 10gb RAM, running OS 10.6.8.

My DAW is Steinberg Nuendo 5.5.2.359 that I'm still using in 32bit mode, in the VST Audio System page the card is set to externally clocked.

Basically every time I run a session at 48KHz, and I use the ADAT port on the HDSPe to communicate with the Apogee converter, the ADAT clock becomes totally unstable.
The ADAT SYNC light on the ADI-4 DD start flashing, and the input status of the ADAT port on the HDSPe settings moves continuously from LOCK to SYNC.

I never experienced this problem at 44.1KHz.

I tried to reinstall the drivers and upgrade the firmware of the HDPSe, I also tried any possible combination of clock sources, but nothing worked.

This is a huge problem for me, I just finished mixing an album and I literally spent hours bouncing every song, rather than minutes.
It was really embarrassing in front of my clients.

Thanks in advance for the help.