Screen sharing not working

Has anyone else experienced the screen sharing not working?

I have tested this on several Macs with multiple OSs, and browsers. I can initiate a screen share but nothing displays. It is acting like what you see if you only share a single window except nothing displays at all. When selecting what to share I can only choose desktop. The options to select a program or window do not have any options.

On the windows machines I have tested on, as soon as the screen share is initiated, it quits as if the share has been stopped.