Samba guest share and writeable

Hello everybody

i have a problem with my redhat entreprise 6 and samba

i would like create a share directory with samba but without auth and writeable,
i have a same configuration on my redhat entreprise 5 and work fine

but i reproduce my config on my redhat 6 but is doesn't work,

for guest is ok but can't create a new file or directory

this is my config

# Global parameters
[global]
        log file = /var/log/samba/log.%m
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
#        force directory mode = 777
        force group = apache
        map to guest = Bad User
        encrypt passwords = yes
#        public = yes
        dns proxy = No
        netbios name = Dev Server
        writeable = yes
        delete readonly = yes
        printing = cups
        server string = SMB Dev Server
        workgroup = WORKGROUP
#        force create mode = 777
        os level = 20
        force user = apache
        printcap name = cups
        create mode = 644
        max log size = 50
        directory mode = 644

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

[WWW]
        path = /data
        force user = apache
        force group = apache
        read only = No
#        create mask = 0777
        force create mode = 0644
        directory mask = 0744
        guest ok = Yes

And my share directory
drwxr-xr-x.   5 apache apache  4096 Apr 22 17:30 data

Smbstatus on RH5

Pid          Uid        DenyMode   Access      R/W        Oplock           SharePath   Name   Time
--------------------------------------------------------------------------------------------------
29740        48         DENY_NONE  0x100001    RDONLY     NONE             /data   .   Sun May  1 13:16:24 2011

Smbstatus on RH6

Pid          Uid        DenyMode   Access      R/W        Oplock           SharePath   Name   Time
--------------------------------------------------------------------------------------------------
9857         48         DENY_NONE  0x100081    RDONLY     NONE             /data   .   Sun May  1 15:24:57 2011

Best regards