Play button functionality perhaps isn't intuitive

I clicked on library then clicked on an album. I started playing the album but decided I wanted to instead play a playlist. Rhythmbox doesn't have a stop button, but pressing the play button again causes the music to stop playing (which in itself is very odd).

I then clicked on a play list and then hit the play button. Instead of the playlist playing, the album I had been listening to before resumed playing. I thought that maybe if I skipped to the next song it would go to the song in my playlist, since the previous playing song was still shown, however it went on to the next track on the originally selected albut.

I tried clicking various buttons with no affect. Finally I found that if I close the program and re-open it that I can play the playlist.

What should happen is if I stop playing music then switch to a playlist instead of unpausing the previous playing track it should instead begin anew with the track selected in the playlist.