I have discovered that there is a bug in Excel 2003 (and Excel 2002), which I
think has propagated since Excel 97. I have found references to this bug for
Excel 97 (with workarounds identified), but the bug still exists and worse,
the workarounds identified for Excel 97 do not work. Here is what I have
discovered:

Place an ActiveX button on a worksheet with vba click code supporting it.
Activate the control (press the button).
Save the workbook before activating any other worksheet (or workbook) and
before manually selecting any cell on the worksheet.
With vba code in the Workbook_Open subroutine that either selects or
activates the worksheet that contains the ActiveX button, re-open the
workbook.

Excel crashes with a 32809 run-time error at the line that selects or
activates the worksheet (or any range on the worksheet) with the ActiveX
button. Less frequently, it may crash with a 57121 run-time error at the
same point.

Excel 2003 seems to corrupt the vba code somehow, because Excel 2003 does
not recover from this error (even by resetting vba execution) until the
workbook is closed, opened with macros disabled, saved, and then re-opened.
The workarounds identified for Excel 97 of setting the "TakeFocusOnClick" for
the ActiveX button to false does not help in Excel 2003.

The error does not show up if any manual selection is made prior to closing
the workbook after pressing the ActiveX button.

Does anyone have knowledge of this problem or comments?