Hi Bill,
I completely understand that. See this screen shot below:

I am inserting audio from the event browser and into the timeline where the skimmer is. It is in between a cut. Audio is VO and I place it in the primary storyline. Whenever I insert in between 2 cuts (as seen in the screen shot), even with the skimmer placed exactly where I want the insert to be made, sometimes these little slivers or slugs appear.