IGMP through TMG 2010

Hi all

after we upgraded our internet to a 400/400 we needed a firewall that could handle that speed, so we have tried pfsense witch is a pretty good firewall, But I also wanted to give TMG a try, and I must say I ‘am falling for TMG :-)
One thing has driving me crazy, we have IPTV through our wan connection witch is requiring IGMP and multicast to pass the firewall, and this is what is driving me crazy, I have followed the guide on this site step by step http://blogs.technet.com/b/isablog/archive/2009/02/04/how-to-enable-multicast-routing-with-isa-server.aspx and I am now able to get the multicast to my TMG, Unfortunately TMG is blocking it all and i can't seem to get it through,

this is what i get:

Status: An ingoing packet was dropped because its destination address does not exist on the system, and no appropriate forwarding interface exists

Dou Core