Playlists disappeared from Samsung Media Studio, but still on K3!

Well you don't have to use that program. First connect you're mp3 to you're computer. If you're using a PC and not mac there's always Windows Media Player or if you click on the start button on the desktop in the bottom left corner and menu will appear. Click on my computer, there will be a list of items are one of them should be the name of your Mp3 player. Click it and you can access the files on your Mp3 player. If you wish to rather use Window Media Player open it first. On the left hand side there should be a list of the tracks on your library, playlists and you're Mp3. You can access you're files from there aswell. The other thing about windows media maker is you can also synchonize songs on to your mp3.