IGMP not working on FW 3.0.0.8

Using the config of FW2.1.1.4, the IGMP snooping is not working anymore in FW3.0.0.8 on my PowerConnect6224 switches : IGMP protocol and cache are ok, but multicast stream still floods through unregistered ports. Switch also acts as IGMP querier.

FW2.1.1.4 had problems with PIM-SM (which are resolved in 3.0.0.8) so I have to upgrade.

This is my config :

!Current Configuration:
!System Description "Dell 24 Port Gigabit Ethernet, 2.1.1.4, VxWorks5.5.1"
!System Software Version 2.1.1.4
!
configure
vlan database
vlan  2,4
ip igmp snooping 2
ip igmp snooping fast-leave 2
ip igmp snooping querier 2
ip igmp snooping querier 2 address 192.168.2.6
exit
hostname "Dell6"
stack
member 1 1
exit
switch 1 priority 1
ip address 192.168.1.6 255.255.255.0
no ip domain-lookup
logging console info
logging file warning
ip routing
interface vlan 2
bridge multicast forbidden forward-unregistered
name "Omnicast"
routing
ip address  192.168.2.6  255.255.255.0
ip igmp
ip igmp version 2
exit
interface vlan 4
name "test4"
routing
ip address  192.168.4.6  255.255.255.0
no ip proxy-arp
exit
ip igmp
no passwords min-length
username "admin" password xxxx
bridge multicast filtering
ip igmp snooping
ip igmp snooping querier
ip igmp snooping querier address 192.168.2.6
!
interface ethernet 1/g3
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g4
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g5
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g6
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g7
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g8
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g9
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g10
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g11
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g12
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g13
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g14
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g15
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g16
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g17
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g18
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g19
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g20
ip igmp snooping
switchport access vlan 2
exit
!
interface ethernet 1/g21
switchport access vlan 4
exit
!
interface ethernet 1/g22
switchport access vlan 4
exit
!
interface ethernet 1/g23
switchport access vlan 4
exit
!
interface ethernet 1/g24
switchport access vlan 4
exit
!
interface loopback 0
ip address  192.168.6.6  255.255.255.0
exit
exit