Is it bugs on 4.0.219.0 ??

Question

hey
i have a WLC4402 with close to 20 laps.the Laps are broadcasting two wlans one for guest and one for corporate.
recently i did an upgrade on the wlc from image 3.2.119.x to 4.0.219.0.
now the problem is that the guest wlan cannot get ip address form the DHCP scope either in the controller or the switch.all it does is get addresses from the corporate vlan.
my switch is configured as follows
interface GigEthernet 6/6
*****description link to cisco WLC******
switchport mode trunk
switchport trunk encapsulation dol1q
switchport trunk allowed vlan 1,4
switchport
interface vlan 4
description vlan for guests
ip address 172.31.x.z 255.255.255.0
ip helper address 172.31.x.z
ip dhcp pool BTC_GUEST
network 172.31.X.X 255.255.255.0
default router 172.31.x.z
interface vlan 1
10.1.x.x
ip helper address 10.6.x.x
clients on vlan 1 can get ip address from the dhcp but on the guest vlan instead of getting the 172.31.x.w address it gets the 10.1.x.x any reason for this ???

Answer 1

just switched back to the 3.2 image but is still have the same problem,guests client are geting address from the coorporate dhcp scope.
on echanged that was done that i think is causing the problem is that before this the dhcp was on the 10.1.16.x network which is on the same subnet as the native vlan,but now the dhcp is seating on a diiferent subnet whci is the 10.6.1.x network.is this supposed to have any effect on the wlan.
the dhcp is on the vlan 10.6.1.x whic does intervlanrouting with the 10.1.16.x vlan.