WOOHOO!
It's working! I don't understand how it's possible, but as a final attempt I created the dir like you suggested and now it's working. I have a NT machine with Token ring here at work so I can only use Serial to upload. I uploaded one single file and it's playing!
What does strike me is that I did the disk-builder and the upgrade and it still didn't work ??? Simply creating the dir afterwards fixed the problem.
Thanks sooooo much for your help guys!

Frank