MacOS – Writing to a samba share from Yosemite – v. weird

Yosemite 10.10.1 on a 2012 MBA

Samba 4.1.13 on a d-link NAS via the miracle of fun_plug

What works:

• Saving a file to the share from an app's save dialog
• Making new directories on the share from Finder
• deleting files and directories on the share from Finder
• Moving a file from one directory on the share to another in Finder

What doesn't work, and how:

• Copying a file from my mac to the samba share in Finder: Finder Error -36 and a 0-byte file
• Duplicating a file on the share in Finder: Finder Error -36 and a 0-byte file
• cp $file /Volumes/$share/$file: "could not copy extended attributes to /Volumes/$share/$file: Operation not supported" BUT file is created properly on share.

my smb.conf:

[ global ]
netbios name = stuffbox
server string = DNS-325
workgroup = workgroup
security = user
unix charset = UTF8
encrypt passwords = yes
hide unreadable = yes
null passwords = yes
guest account = nobody
max log size = 10
local master = no
log level = 0
dns proxy = no
ldap ssl = no
use mmap = yes
use spnego = yes
socket options = IPTOS_LOWDELAY TCP_NODELAY SO_RCVBUF=131072 SO_SNDBUF=131072
max xmit = 131072
disable netbios = yes
strict allocate = yes
csc policy = manual
allocation roundup size = 1048576
create mask = 0777
directory mask  = 0777
force create mode = 0777
force directory mode = 0777
use sendfile = yes
deadtime = 10
smb passwd file = /ffp/lib/smbpasswd
disable spoolss = yes
nt acl support = yes
acl map full control = yes
strict allocate = no
load printers = no
admin users = sam
vfs objects = streams_xattr
unix extensions = no

[ Media ]
comment = 
path = /mnt/HD/HD_a2/media
browseable = yes
public = yes
oplocks = no
map archive = no
read list = "nobody"
write list = "nobody","sam","@utmp","@sshd"
invalid users =
valid users = "nobody","sam","@utmp","@sshd"

I've played around with the veto files setting, to no avail. Totally at a loss here.