In an Excel 2003 macro, I have 3 workbooks, each of which I close with this
code:

ActiveWindow.Close SaveChanges:=False

This has run for months without incident but now, in each instance, pops up
a form entitled "Document modified," with the prompt:
"The active document has been changed. Save Changes?"

So, I added, before the Close method: "Application.DisplayAlerts = False".

The message still appears when it hits the Close.

The macro was originally written in Excel 2003 & all the workbooks invloved
are Excel 97-2003 .xls files.
However, I am now using Excel 2007, though the primary user of the workbooks
& the macro is still using 2003.

I had made some changes to the macro through my Excel 2007. It had the .xls
open in Compatibility Mode & I saved it as .xls format, not 2007 .xlsm.
Windows Explorer shows it as file type "Excel 97-2003 Worksheet."

Is there something in the 2003 - 2007 relationship that might cause this
problem?

Thanks,
Will