Hi all...
I did resolve this changing access to the NAS through NFS mount volumes in OSX. With AFP or SMB doesnt work.
Also i noticed that with SMB or AFP I can mount the NAS in Finder and it is possible to copy files, but when I try to copy a folder with files inside, the folder is created on the NAS but no files ... with NFS mount works fine. (both NAS that i have and both firmwares 2.01 and 2.02b with the same problem).
I hope this info will be useful.