I don't know if this is an issue of rasplex or openpht, but since I am using rasplex on a RPi3, I post this there.
When I launch e.g. an artist playlist, then I can only skip tracks but not select another one from the playlist directly and play that track instead. Also, if I stop the playlist, I cannot restart it by selecting a track. Is this a bug or has it been always like that? If find that behaviour a bit irritating, since this should be possible in my oppinion.