The only thing I can think of is that you have some VBA running
when the selection changes. Open the VBA Editor (ALT+F11), then
the Project Explorer (CTRL+R). Double-click the ThisWorkbook
module and see if there is any code there. If so, you might want
to delete it (depending on what it does and whether you need it).
Do the same for each worksheet.

Signature
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com
> Hi,
>
[quoted text clipped - 19 lines]
>
> Regards.