Can't set HDX as IN/OUT in AMS and Pref sound

Hi,

I'm struggling to get my new HDX card working totally well.

OSX10.9.3 / PTHD11.1.3 /Clean instal of everything including latest drivers.



I've audio from iTunes but it's very slow to launch a track.

Can't have audio in Safari/youtube too...



In Avid coreaudio it sees my HDX card 32 in/out in AMS it sees it but only permits to use the output, the "use device as input" is greyed out....



4 days on this and I can't solve the problem.



Any idea to help me?



Thank you very very much.