VBA problem going from Office 2000 to Office XP
 

I inheirited an Excel document that has VBA embedded in it. The document and
VBA scripts were created in Office 2000. We now use Office XP. When the
document is opened, a script runs that formats some of the cells in a few
worksheets. When I open the document in XP I get an error stating that there
were some format errors. If I save the document in XP and reopen it, the
error goes away. Can anyone explain why this happens? Is it possible that
the calculations being done in the document are no longer valid because of
upgrading to XP? Is there a way to get a list of what changed from 2000 to
XP (ie dll's moved, VBA libraries restructured, etc.)

Thank you in advance,

AJL