Update: it is not cmd.noprogress causing the problem, perhaps you could look into it.
Steps to reproduce:
- open Navigator 1.3
- perform a large copy operation
copy/move dialog does not show.
If Navigator is closed during the operation the copy/move dialog appears.
If the copy operation is performed before opening Navigator then the copy/move dialog does not disappear.
Update:
It is not Navigator that is causing the problem, it seems to be happening with any script dialog.