The quick search I did indicated Error 424 appears with the message
"Object required". Is it possible the code reads from or writes to a
file on a specific drive? That would explain why some machines
generate the error and others do not. For instance, if the code says
"read from a file on the E: drive" and your machine has mapped drive E:
to server ABC while my machine has mapped to the same server but called
it drive F: my machine will generate the error.