Back again.
So what I did:
Downloaded the latest EuCon driver:
Installed it and activated it in the Device Setup (add Remote Device>EuCon)
I saw that the Nuendo6.xml suddenly dissapeared in the folder:
Macintosh HD>Library>Application Support>Steinberg>Eucon>AppSets>Artist
I copied my original Nuendo5_5.xml into that folder and renamed it to Nuendo6.xml.
Now I have my original setting back (working perfect), but I really don’t know if this is the right way to do it…
Cheers.
Alan