Unable to open files in smb backend. Can browse and create

Hello list,
I've installed Horde groupware and gollem on my server "stockholm", a Debian Etch server with Apache 2.2.3-4+etch6 and a Postgresql 7.5.22 database server and Samba 3.0.24-6etch10.

-Horde groupware webmail edition 1.2.2
-Horde 3.3.3
-Gollem H3 (1.1)

I've configured Gollem to use a SMB backend . I can browse the share and the contents, create directories, upload and delete files. I am however unable to "open" or download files. Clicking on a file in the filebrowser opens another window in "Gollem browser view" of the curent directory. The SMB VFS driver is ok according to test.php. When i try to edit a text-file i get an "access denied" message. I can access the shares from my network through window-pc's. 

hordegroupware.log is set to PEAR_LOG_DEBUG. 
******hordegroupware.log******
Apr 16 15:08:40 HORDE [debug] [gollem] Max memory usage: 1572864 bytes [pid 11333 on line 339 of "/home/www/html/horde/lib/Horde/Registry.php"]
Apr 16 15:08:41 HORDE [debug] [gollem] Max memory usage: 2359296 bytes [pid 11333 on line 339 of "/home/www/html/horde/lib/Horde/Registry.php"]
************

My conf.php says:
******gollem/config/conf.php:******
<?php
/* CONFIG START. DO NOT CHANGE ANYTHING IN OR AFTER THIS LINE. */
// $Horde: gollem/config/conf.xml,v 1.5.2.3 2008/10/09 20:54:40 jan Exp $
$conf['backend']['backend_list'] = 'shown';
$conf['foldercache']['use_cache'] = false;
$conf['menu']['apps'] = array();
$conf['user']['alternate_login'] = false;
$conf['user']['redirect_on_logout'] = false;
/* CONFIG END. DO NOT CHANGE ANYTHING IN OR BEFORE THIS LINE. */
************

My backend.php says (removed all commented lines):
******gollem/config/backends.php:******
<?php
$backends['smb'] = array(
     'name' => Auth::getAuth() . ' on Stockholm',
     'driver' => 'smb',
     'preferred' => '',
     'hordeauth' => true,
     'params' => array(
         'hostspec' => 'stockholm',
         'port' => 139,
         'share' => Auth::getAuth(),
         'smbclient' => '/usr/bin/smbclient',
         'permissions' => '770'
     ),

     'loginparams' => array(
     ),

     'root' => '',
     'home' => '',
     'createhome' => false,
     'clipboard' => false,
     'attributes' => array('type', 'name', 'edit', 'download', 'modified', 'size')
);
************

Furthermore, /var/log/samba/log.stockholm says (don't know if it is relevant):

******log.stockholm******
[2009/04/16 15:50:14, 0] auth/auth_util.c:create_builtin_administrators(785)
  create_builtin_administrators: Failed to create Administrators
[2009/04/16 15:50:14, 0] auth/auth_util.c:create_builtin_users(751)
  create_builtin_users: Failed to create Users
[2009/04/16 15:50:14, 1] smbd/service.c:make_connection_snum(950)
  stockholm (10.0.0.15) connect to service rolf initially as user rolf (uid=1000, gid=1000) (pid 12424)
[2009/04/16 15:50:14, 1] smbd/service.c:close_cnum(1150)
  stockholm (10.0.0.15) closed connection to service rolf
[2009/04/16 15:50:14, 0] auth/auth_util.c:create_builtin_administrators(785)
  create_builtin_administrators: Failed to create Administrators
[2009/04/16 15:50:14, 0] auth/auth_util.c:create_builtin_users(751)
  create_builtin_users: Failed to create Users
[2009/04/16 15:50:14, 1] smbd/service.c:make_connection_snum(950)
  stockholm (10.0.0.15) connect to service rolf initially as user rolf (uid=1000, gid=1000) (pid 12426)
[2009/04/16 15:50:14, 1] smbd/service.c:close_cnum(1150)
  stockholm (10.0.0.15) closed connection to service rolf
[2009/04/16 15:50:15, 0] auth/auth_util.c:create_builtin_administrators(785)
  create_builtin_administrators: Failed to create Administrators
[2009/04/16 15:50:15, 0] auth/auth_util.c:create_builtin_users(751)
  create_builtin_users: Failed to create Users
[2009/04/16 15:50:15, 1] smbd/service.c:make_connection_snum(950)
  stockholm (10.0.0.15) connect to service rolf initially as user rolf (uid=1000, gid=1000) (pid 12428)
[2009/04/16 15:50:15, 1] smbd/service.c:close_cnum(1150)
  stockholm (10.0.0.15) closed connection to service rolf
[2009/04/16 15:50:15, 0] auth/auth_util.c:create_builtin_administrators(785)
  create_builtin_administrators: Failed to create Administrators
[2009/04/16 15:50:15, 0] auth/auth_util.c:create_builtin_users(751)
  create_builtin_users: Failed to create Users
[2009/04/16 15:50:15, 1] smbd/service.c:make_connection_snum(950)
  stockholm (10.0.0.15) connect to service rolf initially as user rolf (uid=1000, gid=1000) (pid 12430)
[2009/04/16 15:50:15, 1] smbd/service.c:close_cnum(1150)
  stockholm (10.0.0.15) closed connection to service rolf
************

Hope someone can help as to where the error might be. Thanks in advance,
Rolf Deenen
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