Same.  Looks like if you want attendees to be able to unmute, you need to use meeting center.  In webinar you need a co host in the breakout room to manually unmute an attendee who wants to speak.  Works just like the main webinar session. 

@Mary_Gonzales I did some testing with this a few weeks ago.  So panelists can unmute themselves freely in a breakout, but attendees can not.  They would have to be unmuted by a host/co host that is in the breakout room.     As a future enhancement i...

In your webex account, click on calendar, then completed webinars.  Click on the webinar and  then the activity tab.  There should be a chat file listed there.

If your mic and everything was working in the first 10 minutes, I would guess that it is your local network connection causing these issues.check this out: Webex Audio Troubleshooting