Coby,
You don't provide enough information for anyone to provide any
real help. The answers to your two questions are... Yes and Yes.

Posting your code along with the Excel version on the problem
machine would get things going.
You would also need to explain in general terms what your code
is intended to do. (including if it modifies toolbars/menubars)
Note that Excel 2007 does not have a menubar or toolbars.

Also, there should be error handling in code provided to others to use.
The errors displayed would have been the place to start to in determine the problem.

Starting fresh in a new post with the extra information may be the way to go.
This post now has an answer (mine) and others may ignore additional
questions posted to it.
--
Jim Cone
Portland, Oregon USA
http://www.realezsites.com/bus/primitivesoftware
(Excel Add-ins / Excel Programming)




wrote in message
I created an Add-In Using Excel 2003, maintained in a password-
protected project and have had many people using it without any
problems.
However, I have given it to a new user and it causes the entire Excel
application to stop functioning.

The user tells me that none of his menu bars work and the only option
he has it to close the application.

Could this be because he may be using a different version of Excel
than which I created the add-in from?
Or, something else, perhaps?
Thanks for your help.
Coby.