Rockbox

I was trying to remove a track from a non-current (not playing) playlist using the playlist viewer. I can remove the track but when I return to the playlist, the change is not persisted. While in the viewer I try forcing a save to the same file name as was loaded and I get the following error message: "error accessing playlist file".

Because of this problem, the only way I remove tracks from a non-current playlist is through "Open with" text_editor. And that is pretty inconvenient.