I am running Zen 6.5 SP1b and when I try to start a multicast session
from within ConsoleOne it doesn't work at all.

If I go to the server and Manually start a multicast, it works just fine.

I made sure I gave rights to the correct folder for that session. I am
not using any filters in the sections to include only certain
workstations. I just set it up to start the session after 7 clients have
joined for example. The session never starts.