Thank you for your suggestions! No, I haven’t solved the problem so far. I have tryed asio4all, but it didn’t work, same silence as before. For the moment I wait for an answer from the official support (I have sent questions both to Steinberg and to Mackie).
When I finaly find a solution I will post it here. Maybe it can help someone else?
By the way, I like your computer konfiguration. It´s pretty much like my new computer, but you have a little more of everyting when compared.