logged in, but can't see new jam from others

WS
You or They might be setup for a private jam. The initiator of the session needs to invite you or open the session up to everyone.If you are new to this, take 30 minutes to look at the Tech Support forum.WS

Thanks WS. A little more detail on how to use private jams:

After clicking “New jam” in the “Connect to server…” dialog you will be in your own private jam session. No one can join it or see it yet. Please go to Admin | Access Control to control who is allowed to join your jam session.

Once you've added their usernames they will be able to see the jam session when they open the “Connect to server…” dialog.