I have 2 local music libraries. Since the error code 913 problem, which I fixed as per this community topic, one library will load and one will not when I add them using the Sonos app. I am on a windows 10 laptop. I a moved a file from the library that will not load to the library that does but that file will not load. Most of the files in the old library have been loaded from CD whereas the library that loads have been MP3 downloads. I am not sure if this is a red herring.