Hi,

Maybe you have some worksheet change code that executes when you type in a
cell?

Try opening your workbook with macros disabled and see if you get it back
then.

Mike

"Chris T-M" wrote:

I have a 1 MB Excel Workbook where UNDO icons and menus are greyed out and
unavailable. I know Excel has limits on what it will UNDO, but I just tested
it by typing an X in a cell. The UNDO icon highlights until I leave the cell,
and then I can't UNDO any longer.

Any ideas how to turn UNDO back on?