i have some files and folder that there is no user or group in their security tab.
also when i copy a directory with sub directories it always stop on the no security folder and i have to give him a user or group, and then stop in another folder.
The cause could be that it was removed and then propagated to all folders below it? Or maybe it was just removed.
If you go up one folder, do you see objects in the security tab? If so, click the advanced button on that folder's security tab and see if settings are being inherited. You can force the sub-folders to have their settings replaced in the advanced section too. Try overwriting these security settings to get all sub-folders properly set.