Version:           1.4.6 (using KDE 3.5.7, Kubuntu (feisty) 4:3.5.7-0ubuntu1~feisty2)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-16-generic

Amarok from Kubuntu Feisty, KDE 3.5.7

Random Mix playlist is active.

One track is constantly being added to the playlist, approximately every second.(screenshot 1)

When this track has finished playing, playback stops (although controls still show stop icon). Status bar at bottom left shows Populating Playlist and same track is added again. (screenshot 2)

Double clicking on any of these tracks in the playlist will start playback and stop any further additions to the playlist.  Once the track has finished the loop is restarted (same track being constantly added.) (screenshot 3)

After clicking on another completely different song (about 5 songs ahead in the playlist) playback starts correctly with no new additions to the playlist. There is no looping. Upon completion of this new track, Amarok continues to add the original track in a continuous loop. (screenshot 4).