I get a variety of messages telling me VBA is "Unable to get [set] the
xxx property of the Range class". xxx may be Interior.Pattern or
Numberformat, for example.

Password protection is managed by code in this application, but at the
points the problem arises, I have executed code in the immediate
window to unprotect the workbook and all sheets. Plus, this works fine
on 3 other machines.

All four machines on which this is run have the same configuration:
Excel 2003 (11.6355.6408) SP1 and XP Pro 5.1.2600 SP 2 build 2600. We
also have the Framework CLR. The appliction was developed on one of
the other 3 machines.

This is very frustrating! Any clues would be much appreciated!