Number formats default to dates

[PaulaK]

I have a user that every time he opens a workbook, the columns that were
numbers default to dates, he changes the format back to number & saves. Then
when he opens it again its back to dates - where is the setting that is
defaulting the cell format to dates?

Thanks

 

[NDC]

I have a user that every time he opens a workbook, the columns that were
numbers default to dates, he changes the format back to number & saves. Then
when he opens it again its back to dates - where is the setting that is
defaulting the cell format to dates?

Thanks

This is happening to some of my users too. Will be interested in the
solution.