Andy
Customizations are saved in a file named *.XLB
XL2000 and 2002 *.xlb file will be in Documents and
Settings\yourname\application data\microsoft\Excel and be Excel9.xlb
or Excel10.xlb
Perhaps this file is going astray? If on a server, this can happen.
Search for *.xlb and see what you come up with. When you get your
customization done, make a backup copy of the *.xlb file.
One more fact about *.xlb files. If they become too large, they
have been known to cause problems with Excel.
Gord Dibben Excel MVP