PT 10/11 HDX in Magma EB3T and Mac Mini

My system consists of:



PT HDX with latest firmware / Mac Mini running OSX 10.9.3 / Magma Expansion Chassis 3T



My status is:



HDX hardware shows up in the Coreaudio Manager and HW setup.

HDX hardware shows up in the mac system prefs.

HDX hardware shows up in the Audio Midi Setup app (with 64in/64out)



My issue is:



Once PT 10 or 11 is started, the HDX hardware is not available as a playback engine. When hardware tab is selected and audio midi setup is launched, the PT hardware appears suddenly to have 0in/0out.



I have tried trashing prefs, re-installing the HD drivers etc. Nothing seems to work to make the HDX hardware show up int he playback engine dialog.



Please help.