Duplication not showing progress window?

I have a script that duplicates a series of of files and folders and for each one pops up a finder copy progress box. At least it does on some Macs but not on others. I’m testing on a mixture of OS 10.2 and 10.3 versions and wonder why this is happening. Is there a difference in default behaviour betwen different AS versions?

Is there a way of forcing it to show the progress in my tell finder block?