J & E
Have you been doing a lot of menu and toolbars customizing?
Sometimes the *.xlb file where Excel stores these gets a little bloated and
can cause this message.
Do a file search for *.XLB
You may find more than one. In that case, make some menu or toolbar changes
and see which *.xlb file updates.
Since you don't mention your version of Office/Excel I can only guess where
the *.XLB file will be stored.
In Excel 97 would be in Windows folder and named username8.xlb
2000, 2002, and 2003 are Excel9, 10 and 11 respectively and are usually stored
in
C:\Documents and Settings\user\Application Data\Microsoft\Excel
With Excel closed........rename to Excelx.old
Excel will build a new one next time you open.
Note: this will wipe out any customizations you have done.
When you get running properly, make a regular backup of the *.xlb file.
Gord Dibben Excel MVP