Dear @mark, yes i recieved a ticket from Ryan @DusX , to whom i'll copy this post, i agree with the overload, so i put the flood down with a pulse but the problem remains... I guess it comes more from the Enttec interfacing or the matrix user actor, thanks.enttec-user-actor-demo-v3-benedit.izz.zip

I fixed the problem -  I tried Qlab a it "hold me" that there were two files in my library that i should delete to make the DMX USB PRO interface work agin i did and it worked ... It was this two... - D2xxHelper.kext- FTDIKext.kext Thanks for the replys.  

Great, thank you all!It is so helpful. I will research a bit more and then will decide.All my best,Shigezo