bandnook.com
This software has special requirements (for the video streaming and live interaction part, regular shared web hosting is not enough): http://www.videowhisper.com/?p=Requirements
If you have a RTMP server make sure its functional and accessible.
If it worked before, restart it (often required for Red5 servers that freeze).
For further assistance and troubleshooting, submit a ticket:
http://www.videowhisper.com/tickets_submit.php
Plugins are functional as in demos.
For support on specific setup, contact directly from VideoWhisper site as forums are not monitored.