Hi regarding to mutlicast, did you configured the multicast in image profile?
For instance to make it works in my enviroment I had to configure these two things in my image profiles:
With for instance :
[code]--interface 10.33.101.4[/code] for Sender Arguments, which tell that for this session, the server will send the image using this IP.
and [code]--mcast-rdv-address 10.33.101.4[/code] for Receiver Arguments wich the client the server has the IP 10.33.101.4.