Prior to the latest update, when listening to a playlist, the song currently playing was highlighted by having the text be green and some other UI elements. That's not the case anymore, making it difficult to find where you are in a long playlist.
Example of "not highlighted":
Example of "highlighted":
The text is green, showing that it's important.
Previously, when playing a song from a playlist, the song that is currently playing is shown in the playlist as highlighted. That is no longer the case, and makes it difficult to find in a playlist the song that is currently playing. This is shown below where the song does not stand out at all from the other songs on the playlist, even though it's the one currently playing while playing the playlist.