I am working with a spreadsheet that has been used for a number of years, and changed countless times. Now some of the cells in the spreadsheet will not permit changes. Everytime one of these cells is modified, Excel gives the message "Can't change this cell." No information is available in help, and I have found nothing about this specific error message anywhere on the internet or in Microsoft's database. The workbook is macro-free and no protections are turned on. Has anyone encountered this before and do you know how to fix it other than copying things to a new workbook?
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