Can not view available samba shares but I can access them

[gmac]

Operating system Debian Linux 6.0
Kernel and CPU Linux 2.6.30-2-kirkwood on armv5tel

I am a newbie. I have had server running for over a year and have run into my first major issue. I am no longer able to browse to the server by hostname or IP and view all available Samba shares. I receive a windows popup informing me I do not have permissions
However
I am still able to browse to the shares themselves \\hostname\share.

I am currently assuming this is an issue with the config of the samba share module/

Master Browser is set to yes


[global]
log file = /dev/null
passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
obey pam restrictions = yes
include = /etc/samba/dhcp.conf
null passwords = yes
encrypt passwords = yes
passwd program = /usr/bin/passwd %u
passdb backend = tdbsam
dns proxy = no
server string = PlugGET Server
unix password sync = yes
workgroup = WORKGROUP
os level = 20
syslog = 0
security = share
panic action = /usr/share/samba/panic-action %d
max log size = 1000
pam password change = yes

[gmac]

Is there any other information I can provide?