Thanks
I changed this line in the 'config.php' file in the 'kcfinder/conf' directory and it seems to work - although the site is not not yet live.
from this:
$_SESSION['KCFINDER']['uploadURL'] = "../.." . $userUploadFolder
to this:
$_SESSION['KCFINDER']['uploadURL'] = "../../.." . $userUploadFolder