Add to playlist does not work

[maexel127]

Dears,
I am using clementine on a raspberry pi with the latest version of 1.3.1 as well as the latest clementine remote app. Since some days/weeks I am no longer able to add songs/albums from the library into an existing playlist. It shows me the notification in the app "one song added" but in fact it didn't add the song. Do you have any ideas ?
On clementine itself on the raspberry everything works perfect. besides that, that remote app works fine as well, only adding songs to the playlist does have a problem.
Any ideas ?
BR, maexel