In 6.2b2 when Random Mix is used slimserver gets confused as to what track it is
displaying.  If there are 3 recently played songs the player should always be
Now Playing track 4.  When it starts it works fine as it is advancing tracks
while it populates those history tracks.  Ultimately the player will try to
advance to track 5, then when the plugin refreshes the playlist it should be on
track 4..  but it's now displaying the now playing information for track 5. 
Playback is not affected, but the wrong song is displayed.

The problem seems more easily recreated if the next track button is used to
advance tracks a few times.