I've found ad-hoc playlist made from ADD TO SELECTED often does not work. Here are other issues:?. Does not add? at all OR only adds after first song selected played2. Cannot swith from ARTISTS to SONGS w/o killing list. This will kill the ongoing list.3. If I make mistake and hit the PLAY button, it wipes out the entire list I'd already made. Any of these issues resolved in Zen Vision M?