[Banshee-List] red circle on iPod tracks

[Charles Herman <cherman wildblue net>]

I am using banshee 0.11.2 on SUSE 10.1.  When I use Banshee to listen to 
my iPod, I have noticed that some tracks have a solid red circle at the 
far left of the track  line.  This red circle has a white exclamation 
mark in its center.  The problem is that I cannot play these tracks.  
What is the  significance of this red circle?  In particular, what do I 
need to do to be able to listen to these tracks?

-charles