I discovered that changes made to one worksheet were being propogated automatically (not what I wanted) to all the other worksheets in the same XLS....the only thing out of the ordinary is that the title bar says:
Microsoft Excel <xls name> [Group]
The [Group] thing isn't in my other spreadsheets so I suspect this has something to do with the problem.
Searching for 'group' in the help system seems to be fruitless
Office 2003 (I should have stayed on 97'; I was happy there)
Ideas how I can undo this?