Edit: seems that if you omit {ttl=x} block, you get default ttl of 0, which equals to a BROADCAST instead of MULTICAST. This is true even in case the server is connected to CISCO IGMP/CGMP routing switch.
Same experience, I've been trying to contact them for the past 3 months... sent about 10 emails.. tried calling, phone numbers seem to be disconnected.
Whoever sold you the Aminet 110 is also responsible for supplying you with the firmware and installation guide, a NDA might be needed faxed to Amino though.