I've had issues before with OpenFiler where doesn't update the permissions, although they appear correct in the UI. To rectify that, I stumbled upon a one liner that fixed it. Let's say you have a group called "Trusted" that you want to have full access to your music folder. Here's the one-liner:
[root@files data]# pwd /mnt/openfiler/data root@files data]# setfacl --recursive -m u:nobody:rwx,g:Trusted:rwx music