WMP requires a Plugin for Flac… I think its is on Windows’ website. As for your disappearing songs, try changing the tags to that the album matches that folder you tried to add them to, and then re add them just as general tracks in your music folder, not in the Album spesific folder.
I don’t understand what you mean by “try changing the tags to that the album matches that folder you tried to add them to, and then re add them just as general tracks in your music folder, not in the Album spesific folder”.
Google Flac Tag Editor. Id3Tags are the way most of the newer sansa products tell your track information. Song name artist or what ever. Then plug your player in and use windows to delete the files. Then Just go into the song list, and re add the files in that folder. If you Tags match the album you want to add the files too your player should do it for you.
Anyone using FLAC or Ogg Vorbis would be much better served by Winamp or MediaMonkey than WMP. It’s possible to get it working in WMP, but it’s a PITA.
Winamp has excellent native FLAC/Ogg support and blows away WMP anyway.