Lack of sound FIX
I found the problem with the lack of sound is that there isn't support for Google Chrome. If you just use a different browser like Mozilla, you'll have sound! :)
Hey now, we do support Chrome. In fact, most of the team and most of our users access Duolingo from it.
Unfortunately, problems with sound and microphone input happen to people in certain browsers for various reasons. If you have extensions installed in Chrome, try disabling them, restarting the browser, and see if that fixes the problem. If you don't have any extensions installed, see if sound is working on other websites in Chrome like youtube.com.
can you try going here and tell me what it reports: http://duolingo.com/sm2_diagnostics/sm2-troubleshooting-tool.html
SM2 SWF V2.97a.20130101 (AS2/Flash 8) ExternalInterface available Adding ExternalInterface callbacks... Testing Flash - JS... Flash - JS OK Waiting for JS - Flash... JS - Flash OK Enabling polling, 50 ms interval
Sound does not work. When I click on the speaker button nothing happens.
I use firefox, with multiple plugins. I had no sound, despite sound working OK in different sites. But I found the problem source, that was flashblock. I had to add duolingo.com to a whitelist. The rest of blocking addons (like adblock or scriptblock) were not causing any trouble. I'm posting this for other people.
In my case, the problems were caused by flashblock add-on for Firefox, so I added two domains to its (plugin's) whitelist: duolingo.com and cloudfront.net (the content is hosted by this provider), and restarted firefox. It worked.
I recommend everyone having problems with sound :check if sound works with the same browser on different sites that use flash (youtube for example), and if it is a case only with this SITE, add the mentioned domains to whitelists of any blocking addons you have.
You haven't been very specific. Please be:
Have you tried to reinstall flash plugin?
Is the sound working OK in other sites?
What version of Chrome and Flash do you have?
Did you install any addons or plugins for Chrome?
What does report Duolingo Tool: http://duolingo.com/sm2_diagnostics/sm2-troubleshooting-tool.html ?