One easy fix for a number of errors caused by minor database issues, which also re-ranks all times in the database is:
  1. Go to File, Repair/Compact database and run through this feature
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  1. You will be prompted to backup your database.  If you don't have a current backup that is an excellent idea
  2. If you have run one or more reports since opening the software you will first need to close the software and re-open it to run the repair