Never mind. After several times uninstalling, deleting all associated files that were left, cleaning registry and so on before re-installing didn't work, I used system recovery to get the system back a couple of days before I installed PD. After this I did a clean install of CAM and then PD and now all works...
I don't know what the problem was. Maybe because I had downloaded the free version first where there are only a very limited amount of music-files and upgraded to the subscription afterwards. I don't know...