There are lots of things that can reset the undo/redo stacks.

You could have run a macro (or an event macro could have fired).

You could have saved the workbook.

There's a setting in the windows registry that tells excel how many undo levels
to keep track of--maybe it was set to 0.

xl2k and above
XL: How to Modify the Number of Undo Levels
http://support.microsoft.com/?kbid=211922

xl97
XL97: How to Modify the Number of Undo Levels
http://support.microsoft.com/?kbid=162944



sheana wrote:

Don't know if I should have said "gray" or "grey", but my "undo button"
remains grayed out even though I'm entering data in and selecting cells.
There is also no "Redo" button. Is there some setting for this that I'm
unaware of?

Thanks inadvance.

--

Dave Peterson