I have an Excel 2010 file with 10 worksheets, 9 containing look-up tables and derived charts all referring to the first which has all base data.Though I could do so early-ish in its build, I can no longer delete a sheet; add a sheet; or hide or unhide a sheet. Though the individual sheets had been password protected they are no longer. Can anyone explain?
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It might be Password Protected , in your Excel 2010 , open the file and click on File –> infos and see its status.