[Samba] Samba not honouring write/admin lists on shares

[Lincoln Smith]

I'm running debian testing, so samba 3.05 atm.  As of a few upgrades ago,
which i think coincided with a library restructure or somewhat samba is no
longer honouring read/write/admin lists on share definitions.  Using the
below share as an example, previously all users could access the share with
read access, and those in the ntadmins group had write access.  Since the
upgrade users can only obtain read access.  This occurs regardless or
whether a write or admin list is used.  It is as if the write list is being
ignored.  If the sense is inverted and the share is made writable then
access cannot be restricted using read lists.

I admit to being at a loss.

[audiofiles]
    path = /home/ftp/audiofiles
    guest ok = yes
    writeable = no
    write list = @ntadmins
    force user = ftp
    force group = nogroup

Cheers
Lincoln Smith