Form.Show Problem in Excel 2003

[raymond.allan]

Hi,

I have a form named "Main" which occasionally err's out on the
Main.Show line when ran on Excel 2003, if Continue is clicked the form
will appear but other unexplainable problems then start appearing in
other modules when the user selects options from the form

Until recently the code below has worked fine in Excel 2003
(11.5612.5606), I do not know if there has been any office updates made
to the PC's that use Excel 2003 which has caused this to err on the
Main.Show line (See code snippet below)

I myself use Excel 2000 (9.0.4402 SR-1) as do a lot of other users and
the code works fine

Code below is in a Autpen module

With Main
.dFolder = "\\Kels-dsk-001\Projected Inventory\"
.wFolder = "\\Kels-dsk-001\Shared\Raymond Allan\"
.NewFile.Value = ThisWorkbook.Name
.MultiPage1.Value = 0
.cb6 = False
.EndOfQtr = Format(GetLastQuarterEnd, "dd-mmm-yy")
.fMonth = Month(Now())
End With


Windows(Main.NewFile).Activate
' Hide the workbook during the running of the program
Windows(Main.NewFile).Visible = False

Main.Show

Any help or advice on this greatly appreciated