I have an Excel workbook that I have been using for 6-7 years, initially in
Excel 2003; and more recently in Excel 2007 (where it is saved as an .xlsm
file).

There is a user form to enter data, and one of the pieces of data is a Date. I
could either enter the date directly, or select the different sections (M/D/Y)
and use up/down arrows to change the date. I don't recall how I set this up
initially.

I copy this file back and forth between two different machines -- a Windows XP
machine; and a Windows 7 machine.

Today I opened it on the Windows 7 machine, and the Date field on the user form
was gone!

The code is still there. It merely sets the initial value to today. FirstRun
is a variable that gets set to TRUE by UserForm_Initialize

========================
Private Sub Dt_Enter()
If FirstRun = True Then
Dt.Value = Int(Now())
FirstRun = False
End If
End Sub
======================

Why did the Date field disappear?

How did I set this up in the first place?

Thanks.
--ron