Hello tjbrunetto,
I'm unable to reproduce this. It would be great if your could provide a screenshot of the exact settings you use in the path constraint, as well as the hierarchy of your bones, where you encounter this error.
I only experience this behavior when Spacing
is set to Length
while using zero length bones. What you referred to as "bullseye" I believe.
If there is indeed a bug, we would love to fix it!