Hi Garry123,
Sorry about the problems that you've been experiencing with the chat on uStream. I myself had some problems when trying to chat and my experience was identical to the one you described. Here's what I think happened. For some reason, your Facebook account didn't give the uStream app enough privileges to post a comment. So you need to uninstall the uStream app and then reinstall it on your Facebook account. Here's how you can do that.
1. Go to Facebook (
https://www.facebook.com)
2. Log in on Facebook
3. In the upper right corner of your window, you'll see an "Account" menu.
4. Click on the "Account" menu. You'll see that one of the choices is "Application Settings"
5. Click on the "Application Settings" menu item. You'll see a list of all the Facebook apps that you've installed on your account. uStream.TV should be one of them. You'll also see a big "X" that is to the right of each app.
6. Click the "X" that is for the uStream.TV app. That will remove uStream.TV from your list of installed applications on Facebook.
7. Go to the Beat The GMAT B-School Essay page (
https://www.beatthegmat.com/mba/business-school-essays)
8. Click on the Facebook button in the chat window. A Facebook window will pop up. This Facebook window will ask you whether you'd like to give the uStream.TV app a list of privileges.
9. Click the button to give the uStream.TV app all the privileges that it asks for.
10. Enter a test chat. It should work then.
Please let me know if this works.