@Nague: Are you sure IGMP snooping worked correctly also for IGMPv2? My testing indicates that it does not, and I am really frustrated at the moment. I made a post about it here, but the rundown is that with IGMP snooping enabled, the switch drops all IGMP query messages.
What this means, is that a client may send a report/join message to a server, and start receiving the stream, but when the server (after some timeout) sends a query to see if the client still wants to receive the stream, the query is dropped on ingress, so the client never gets it. Thus the server never gets a response to the query, and stops the stream.
Immensely annoying!