Excel 2003 Userform.Show error

Hi All,

I have a problem that is not showing up in excel 2010 (my computer), but is showing up in excel 2003(co-workers computer).

Here is my code in ThisWorkbook

Private Sub Workbook_Open()
Application.DisplayAlerts = False
    
    'If the username is not listed below it will notify the user that they only have access to the reports, they cannot enter any data into the log
    If LCase(Environ("username")) = "username" Then
        InitialForm.Show
    Else
        msg = MsgBox("You only have access to run reports from this file. Please contact the program administrator if you wish to gain access to the data entry.", vbOKOnly, "Authorization")
        If msg = vbOK Then
            InitialForm.Show
        End If
    End If
Application.DisplayAlerts = True
End Sub

When i change the name of the "username" and run it on my computer i get the message box and click ok and the initial form shows just fine and i can push bottons and go from there. When i open the workbook on my co-workers computer (excel 2003), i see the message box then for some reason the VBA editor opens and so does the initial form, but the initial form does not do anything, no buttons work. When i go to the VBA Editor it looks as though something is running.... I am not sure what though, so i click the stop button then manually find the initial form and run it. Everything works good from there. I am not sure why the initial form is showing and not activating, also why is VBA Editor opening when i click ok on the message i have created. Thanks for all the help in advance.


Edit: I have even deleted the lines for my msgbox and the same thing is happening the intial form shows but it is not "active" for some reason, none of my buttons on it work. Does 2003 not allow the workbook_open() command in ThisWorkbook?