I don't understand playlist

I think I really don't understand playlist with zinf (I use zinf under
linux).

When I want to remove a song from the playlist, I select it and I press
"Del".   But when I select more than one song, say for example ten songs,
more songs are removed !  (say for the example twenty five). I don't
understand why !

When I remove too much song, zinf crash and quit.  Same thing when I remove
all the song.

I want to play always some songs.  I put the song in the playlist and I
remove all others songs... a little boring...  I close zinf and, on next
start, the old songs are back without newest songs ! ! ! Ooooooooh :(

I try to press "New playlist".  But when I try to play this new playlist,
zinf play the other playlist who is hidden in another window ! ! !  :(

I try to save current playlist but on restart I have another time the old
playlist !  What's the matter ?  I think I don't really understand how the
program works...


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