Try the following:
1. There should be a 'cog wheel' bottom left. Click this and you should be able to select 'away' commentary
2. If the cog wheel isn't there, try a different browser. Chrome & Firefox appear to work best. Safari generally only has the home commentators.
3. Try selecting the 'Listen Live', then select 'Away', then restart video.
4. Switch everything off & on again!
Problems tend to be more on iPads. Again, try Firefox?