Servers can stop streaming when it's been empty for a while. Does streaming still not work when there's people in it for a while, or if you give it a reboot?
Make sure you have a pbucon.use file in your pb folder on clanforge.
We used to have a strange issue of pbucon.use being removed constantly, even though none of our admins touched it.
If you don't have a pbucon.use file in the Clanforge file list, you can create a text file, save it as pbucon.use (doesnt need any content) and upload it.
Worked for me last time we had a similar issue.
Edit: Also, Clanforge is the admin system, not the host. The host is Multiplay.co.uk