Hi Yaffa, I am not sure about the reason for this error, but if the 2 versions of the spreadsheet are both saved in the 2010 default format xlsx (or you can save them as such), then they are actually in a xml format and as such in a readable text-format. This means that opening both files in a text editor with a file compare function (like notepad++) or with any file compare utility (like csdiff) makes it possible to compare them and deduce from the differences found, where you can find the actual differences in excel. It might not be an easy solution, but it might help you, if you are really stuck. Good luck! Cloggy
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