Hi,
thank you for the hint. I tried and it worked almost instantly, I found just that the last "&" (before ", 0, True") was to much. Removed this, now it works fine. (Not to blame you, just for other users facing the same issue)
WSHSHell.Run sch2pdf & " -p -project " & chr(34) & prj & chr(34) & " -schematic " & sch & " -a " & chr(34) & output & chr(34) , 0, True
You made my day, thanks again - especially for the quick reply.