If your server is showing as not streaming and you know it is setup to stream, send the following command to the server: pb_sv_ver

This happens when the pb task pb_sv_task 0 7200 pb_sv_ver isn't setup correctly and the server is empty for more then 3 hours.

If this server is listed as deactivated and highlighted orange, you must enable it again in the account manager under View Servers and press the Activate link.
A deactivated server will not show as streaming unless it's active.