Thank you for a quick answewr.
I am aware that the playback config is not saved with the score, I try to save it in the playback devices dialog in Sibelius.
On my VSL slave, I have set up a big template using 8 midi-ports in VEpro, that will cover all my orchestral needs, something I will rarely need to change.
I use VEpro as standalone, so i am not using the vienna server at all. The slave is only getting midi, and when I have set up the playback config it works like a charm. The only problem is that it goes away, even though I believe that I'm saving it in the correct way