[Samba] File disappear when saving it with windows seven

[Brenda Scywith]

Hello, 

I have a Debian server up to date with the backport version of samba :
3.5.5. My kernel is a 2.6.26-2-amd64 (64 bits). Everything is working
fine with xp station. But with seven, when I modify a file and save
sometimes the file disappear or when application report an error and the
file is left in old state (not saved). I try remove all kind of lock
with the following configuration directive : 

veto oplock files = /*/
oplocks = no
level2 oplocks = False
blocking locks = no
strict locking = no
locking = no
share modes = no

but my files still disappear !

Do you have an idea ?

Regards,
Brenda