The tag format of choice for all the Sansa players (particularly the newer ones) is ID3v2.3 ISO 8859-1 , not v.1 as you’re using. Some of the older ones would read the v.1 tags and I don’t know why yours did at one time, but is refusing to do so now, but you should update them to the newer tag format to avoid any future issues.
MP3TAG, a free program will make quick work of this. Some people have success editing the tags with the files on the playe, while others recommend that you edit the files on your computer, delete the ones on your player, and re-transfer them over.
