Need to configure Ableton to broadcast on Ustream

[cfurq]

Please help!! I do a monthly music show on Ustream. I recently moved and had to re-set up all my equipment. Since then, I can't get the audio to work on Ustream. I get video, but no audio. I am running Mac OS 10.6.8. I use the Fast Track Pro Ultra interface and Live 8 (Version 8.2.1) I am very new to all of this and I am pretty sure the problem is that I haven't done something, but I have no idea what it is. My friend help me set things up before I moved, but now I'm on my own. I'm pretty sure I am using all of the most recent updates on everything.