Because LW shares our downloaded files by default, nobody ever realises that just correcting the details in their mp3 player isn't enough - you have to fix the file that LW is sharing as well. Otherwise the error gets propogated and its a wildfire...

A suggestion for LW developers (if they read this):

Assuming LW shares its own different folder, not my local mp3 player's library.....

How about LW knows about the local mp3 player and its library, and checks tags there, then corrects tags in its own library? (background process)