Playlist continues playing after last clip

I have a playlist of 4 clips.  The playlist is set NOT to loop but it is set to autoAdvance.  The 2nd clip is a looping clip.  At some point in the game I use QueuePlaylistClip to switch from 2nd to the 3rd clip.  The 3rd is looping as well until TriggerPlaylistClip is used to switch to the 4th clip (last clip).  All works great until the 4th is finished playing (4th is not a looping clip).  At that point the music automatically switches back and plays the 3rd clip.  After some debuging I found that after the last clip PlayNextSong() was triggering and the currentSequentialClipIndex variable was set to 2 instead of 4.  It seems that as I advance through the clips using QueuePlaylistClip and TriggerPlaylistClip, it may not be incrementing the currentSequentialClipIndex variable.
I'm using version 3.5.3.5.
Thanks