unmerge option is grayed out

E

ExcelRookie

The merge option in my spreadsheet isn't working on a particular worksheet.
Regardless of whether the cell is merged or not, the check next to the merge
option in Format is grayed out.

This was working up until 2 days ago.
 
M

Max

Or, maybe a shared workbook* ?
*As listed in Excel help (Type): shared workbooks, limitations
 
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