Gateway IP of win-tap disappeared

HI,

I found the gateway IP address sometimes disappear from windows network 
config after the successful establishment of the openvpn connection.
I m using openvpn beta 14 with winxp as client. The connection protocol 
is UDP with tap.
The "push" config in the server is as follow:

push "ping 10"
push "ping-restart 30"
#push "persist-tun"
push "persist-key"
push "redirect-gateway"
push "route-gateway 172.16.0.1"
#push "route delete 192.168.9.0 255.255.255.0"
push "route 192.168.9.0 255.255.255.0"
push "dhcp-option DNS 192.168.9.254"
push "dhcp-option WINS 192.168.9.254"
push "ip-win32 dynamic"
push "dhcp-option NBT 8"
push "dhcp-option DOMAIN mydomain.com"

Thanks
Sam

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