I can't get ACL working with folders

I use the PHP5 version of ckFinder 2.0.1.

I wish to accomplish this:

One role, named here role1, can access the root dir with restricted rights whilst must be able to access a subdir "filefolder" with different access rights.

Hence I have, in my config file:

$config['AccessControl'][] = Array(
'role' => 'r1',
'resourceType' => '*',
'folder' => '/',
'folderView' => true,
'folderCreate' => false,
'folderRename' => false,
'folderDelete' => false,
'fileView' => true,
'fileUpload' => false,
'fileRename' => false,
'fileDelete' => false);
$config['AccessControl'][] = Array(
'role' => 'r1',
'resourceType' => '*',
'folder' => '/filefolder',
'folderView' => true,
'folderCreate' => true,
'folderRename' => false,
'folderDelete' => false,
'fileView' => true,
'fileUpload' => true,
'fileRename' => true,
'fileDelete' => false);

I can get it to work. The same rights always apply. In fact the rights defined at the root dir always apply.

What did I miss in order to have different rights at different levels of the dir hierarchy ?

I am sure the role transmission mechanism works between PHP and ckFinder with the userrolevar. But does not modify the rights....

Any help would be appreciated.

Thanks

SK