Audirvana studio output under win 10 doesnt work

I normally use the previuous version of the app with no problem.
I have downloaded and installed the STUDIO on my WIN10 PC.
In the old version the app sees my KET LSX as aoutput perfectly NOT SO with the Studio: It doesnt allow me to SELECT by hand output nor select the LSX
I can “see” the LSX in the pop-up menu BUT I cant use them