NSA325 v2 - file permissions problem

Hi to the community.

I recently got my hands on a NSA325v2, FW: V4.81(AALS.1). When I got it, I transferred the contents of my external USB HD to my internal JBOD drives (new drives, 100% health). The procedure was done via the web interface, administrator login.

I set the shares, users etc. Every user has access from the various Windows computers, no problems there.

I realized though, that no user has write access, whatever permission I set. Actually, not even the administrator can modify anything, even from the built-in web interface.

Only by logging via telnet/ssh can the admin delete/rename/move files.

I've checked the file permissions, everything seems right:
"-rwxrwxrwx    1 admin    everyone"

Samba file permissions also seem correct:
/etc/samba/smb.conf

"write ok = yes
  force create mode = 777
  force directory mode = 777
  force security mode = 777
  force directory security mode = 777"

Any ideas?

Thanx in advance