I receive the following error message when closing an Excel file when one of
its unhidden worksheets is active, but not the other:

Run-time error '1004'
Select method of Range class failed

Debug points to code in a Private Sub (not in the Module) relating to one of
several combo boxes in the first worksheet, as follows:

Private Sub ComboBox2_Change()
Sheets("Cover").Range("C13").Select
End Sub

The LinkedCell for each combo box is a cell in the same worksheet, which in
turn feeds into a formula in the second worksheet (and I think this is where
Excel seems to be getting confused).

The ListFillRange for the combo boxes is located in a hidden worksheet.

If the Active Sheet is the forst worksheet, however, the file can be saved /
closed without any errors, so I tried this code:

Sub Workbook_BeforeClose()
Sheets("Cover").Activate
Range("A1").Select

But this did not work.

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R Ormerod