Phillpd,
Is this a "duplicate display" problem or are the expressions with duplicate names independent? In the screen shot the repeated expression names have matching equations and values. Can the duplicate expressions be modified independently? Does delete of one of the "duplicates" remove both expressions? If the expressions are exported to a text file are there duplicates in the exp file? Are there differing versions of Office being used at various times E.g 2007 and 2010?
Regards,
Joe