Oh yes, I followed your advice, got rid of one problem and got a lot of other problems instead.
What happened was that I couldn't access the MP3-player after a re-installation of my computer. So I used the method described in the previous post.
What happened then was that when I did access the files on my MP3-player in order to add some new songs, all the old songs stored on the MP3-player had totally different numbers (and no names) than they had before. So I realized something was wrong and deleted all files on the MP3 and re-installed them.
The result was that when I played the songs on the device, they were badly mixed up. An album with one artist started with a song from another and that song was missing in the file where it should have been etc.
So I formatted the drive and spent several hours to re-install the files, one by one.
That solved most of the problems, except one.
On one album, a song from another album starts and that song is missing from the album where it should have been. I've removed and re-installed over and over again but the problem remains.
If I remove that particular song, another song from the wrong album shows up where it shouldn't belong.
If I remove the complete album, a song from the first album (the one I tried to play in the first place) is removed as well.
Or to make it simple: Album A starts with track 6 from Album B. Track 6 is missing from album B but when I access the files from the computer, everything seem to be in order.
If I remove track 6 from album B, then track 7 will start album A when I try to play it.
If I remove the whole album B, track 4 from album A will dissapear as well.
Note that I've hade those albums and those songs installed for over a year without any problem.
So let's face it: Sansa M240 is CRAP. I strongly suggest everyone who reads this thread to throw it away and buy a new MP3-player and NOT a SanDisk product.
I've written to SanDisk but so far no reply. If I don't get any reply in the next 3 days, my Sansa M240 will make a lovely flight out of my window and down on the street and I will gladly pay a sum to the first driver who runs it over with a car.
I've lost a good nights sleep thanks to this parody of a MP3-player.