1 - Engine Prime no longer exists it has been replaced by Engine Dj so it makes sense that you use EDJ for library building in dedicated media for your SC Live 4.
2 - Special character problems are mostly present in Windows! So I think you are using a PC.
For my part, I do not encounter this kind of problem with my Mac and the same with the Windows 10 Bootcamp partition.
the idtags do use UTF-8 and the ISO 8859-1 text encoding for the id3v23.