Try hiding it.
Then unhiding it.
That's all I've got right now.

Karen wrote:
I recorded a macro over one year ago for a workbook that consists of many
worksheets. I have to edit the macro - I went to Tools Macro Macros
Edit and I get the following error message. "Cannot edit a macro on a hidden
workbook. Unhide the workbook using the Unhide command." This workbook is
not hidden. What else could be happening and how do you fix this problem?
Thank you, Karen