Right-click anywhere up in the menu/toolbar area and choose Customize
from the popup menu. There, choose the Toolbars tab. Scroll down to
the end of the list and select "Worksheet Menu Bar". Click the Reset
button. It might be the case that the workbook in question has code
that manipulates the command bars. Press ALT F11 to open the VBA
editor. On the left side of the screen should be the Project window.
Press CTRL R if it is not there. In that window, find your workbook
and expand all the tree view nodes by clicking the "+" signs. Double
click the ThisWorkbook module to open it for editing. In that module,
look for
Private Sub Workbook_Open()
' some code
End Sub
This is the likely place that the menu modification code would be.
Unless there is a good read to keep it, delete it and save the file.
Cordially,
Chip Pearson
Microsoft Most Valuable Professional,
Excel, 1998 - 2010
Pearson Software Consulting, LLC
www.cpearson.com