I have an Excel model with several VBA macros that I have been maintaining in
Excel 2003 for years with no issues. I recently updated to Office 2007, made
some adjustments to the model, and it works fine on my machine (and fine on
some of my coworkers' machines). However, the exact same file when run on
other coworkers' machines is having issues where the
"Application.screenupdating" is being set to true whenever the code switches
worksheets or workbooks. For example:

Sub ProcessName()
Application.Screenupdating = FALSE
Sheets("Sheet 1").Range("Range 1").clearcontents
Sheets("Sheet 2").Range("Range 2").clearcontents
'Up to this point, Screenupdating=FALSE on ALL machines
Sheets("Sheet 3").Select
'At this point, Screenupdating=FALSE on some machines and TRUE on others
Range("Range 3").Select
Selection.Validation.Delete
Application.Screenupdating = TRUE
End Sub

Again, when running on some machines - no problem (screenupdating remains
set to false at all times), but when run on another machines, it switches to
true. We all are running Office 2007. I have seen many posts on various
forums regarding similar issues, but nothing regarding screenupdating working
on one machine but not another.

Is there an Excel Options setting that could be different between our
machines that could be causing this? Thanks for any help.