AutoCAD Civil 3D :: Survey Points Disappear After Importing Field Books

I’ve run into an issue with importing survey data using field books. 

I started by importing my primary control using a field book.  There were no issues with importing these points.  I then proceeded to import subsequent field books with additional control and then topographic mapping.  In the last field book some points were accidentally overwritten due to an error in the field collection.  No error message was given to let me know the survey points were in use and being overwritten.  Luckily I caught the error before I proceeded to the next field book. 

I tried to reimport the field book that originally created the points that were overwritten.  At that point C3D told me that the points being occupied in the field book did not exist.  I checked the point list for the primary control field book under the "Import Events" in the Survey Tab of the Toolspace and indeed the points in question were no longer listed.

I then proceeded to reimport all the field books in order, starting with the primary control.  I got through several of field books before C3D again told me the point being occupied did not exist.  This despite the fact that this same point was occupied in previous field books.  After trying once again I was able to get through the field books.