samba - Jan 2009 - Samba started asking for a password when trying to access it

Hi,

samba has just been updated on my machine, before the update it was work 
without asking for a password when accessing from a windows machine. Now 
after the update it is asking for a password which whatever I enter does 
not seem to work.

Samba version: Samba 3.0.24-7.fc5
Config file
[global]
        workgroup = FONTERA
        server string = MavinDev
        security = SHARE
        guest account = apache
        log file = /var/log/samba/%m.log
        max log size = 50
        load printers = No
        dns proxy = No
        guest ok = Yes
        hosts allow = 192.168.0., 127.

[homes]
        comment = Home Directories
        read only = No
        browseable = No

[printers]
        comment = All Printers
        path = /usr/spool/samba
        printable = Yes
        browseable = No

[webroot]
        comment = Root of Webserver
        path = /var/www/html
        read only = No

[vhosts]
        comment = Vhost folders
        path = /var/www/vhosts
        read only = No

[backup]
        comment = Root of Webserver
        path = /var/www/BACKUP
        read only = No

[PHP_lib]
        comment = Standard lib of php classes that can be used ANY 
where. (included in the php config)
        path = /var/www/lib

[dev_project]
        comment = Root of Webserver
        path = /var/www/vhosts/dev.dotproject
        read only = No

[profiler]
        comment = Profiler
        path = /var/www/profiler
        read only = No

[transport]
        comment = transport
        path = /opt/xmpppy/
        read only = No

Kind Regards
Wilhelm Ellmann