I have a user that has two excel 2007 spread sheets open and copies from one
sheet to another he saves it then opens it the next day and all the fonts
have disappears. Any ideas???

More back ground, He had this problem in office 2K3 so I decided to upgrade
him to 2K7 because we were only 3 departments from doing that anyhow but it
seem to follow him. so just for S&G's we loaded him on another PC and the
same problem stands, so we ruled out local software and PC it has to be with
the system. I had an Excel guy come and look to see what he was doing to make
sure it wasn't a PEBKAC error. The excel guy said it has to be the file.

More info he does export from SAP to Excel then adds color and changed
fonts size.