ETC$ Access is denied error

Hi

I've have problems writing to the etc$ folder, with 'Access is denied' and 'You need permissions to perform this action'

1. I have created a local account which is a member of the array's Administrator group
2. The adminstrator group has full control on the etc$ share
3. I've tried opening explorer on the Windows 2008 host as administrator and then connecting to etc$
4. I've tried opening explorer on the Windows 2008 host with my personl account which is a local admin on the server and then connecting to etc$
5. I've tried the above and then mapped a share using my array admin account
6. I've tried the above on a different server
7. On 1 out of 4 controllers I've had success by adding my domain account to the array's Administrator accounts, however as I said this only works on 1 out of 4
8. On the array where I have maned to read/write to etc$ the create_ucode=off, on the 'broken' arrays create_ucode=on - could this be the issue?
9. Below are the attributes of the broken array's vol0

> qtree status
Volume   Tree     Style Oplocks  Status
-------- -------- ----- -------- ---------
vol0              unix  enabled  normal

>vol options vol0

root, diskroot, nosnap=off, nosnapdir=off, minra=off,
no_atime_update=off, nvfail=off, ignore_inconsistent=off,
snapmirrored=off, create_ucode=on, convert_ucode=off, maxdirsize=45875,
schedsnapname=ordinal, fs_size_fixed=off, guarantee=volume,
svo_enable=off, svo_checksum=off, svo_allow_rman=off,
svo_reject_errors=off, no_i2p=off, fractional_reserve=100, extent=off,
try_first=volume_grow, read_realloc=off, snapshot_clone_dependency=off,
dlog_hole_reserve=off, nbu_archival_snap=off

> cifs shares
Name         Mount Point                       Description
----         -----------                       -----------
HOME         /vol/vol0/home                    Default Share
                        everyone / Full Control
C$           /                                 Remote Administration
                        BUILTIN\Administrators / Full Control

etc$         /vol/vol0/etc
                        everyone / Full Control
                        BUILTIN\Administrators / Full Control

>exportfs

/vol/vol0       -sec=sys,rw=xxxxxx01:xxxxxx02,anon=0,nosuid

Thanks