No, specifically another workbook named Book1.

"Barry" wrote:

> Do you mean two different sheets within the same workbook?
>
> "Ian@MarlandLtd" wrote:
>
> > This Book1 becomes the current book. If I go to Window on the toolbar I can
> > switch to my correct workbook. Why is this Book1 being opened? I can cure it
> > by closing Book1, then saving my correct workbook, then closing that one. The
> > next time I open my workbook, Book1 has disappeared.