Safari 6 lost audio in HTML5 videos

I used to be able to play HTML5 videos in Safari without a problem--but as of the past week or so, I get no audio. I did a couple of courses through Coursera this summer and the HTML5 videos worked fine. But now that I've started new courses, I have to use Chrome (which I don't like) or use the Flash versions of the video which are not as good. Anyone else encountering problems with HTML5 videos audio?
I've seen older posts about Safari not playing nice with Youtube HTML5s; but that's a long time ago and my Safari was working fine with HTML5 until the last week or so.
My MacBook Pro is mid-2012 and running : OS X 10.8.4 (12E55)

I was just searching for a solution to this exact problem before posting it here myself.
I am also a regulat Coursera student and had managed to watch and hear the HTML5 option videos without problem.
It must be difficult to visualise for people who aren't signed up to Coursera but not unlike YouTube, there are both Flash and HTML5 versions of lecture videos with inline content often in the form of quizzes (or tests, as we call them in the UK!). However, unlike YouTube, it is possible to change settings on the video page.
Just recently (probably aroung the same time Dominique noticed problems) the audio ceased functioning using the HTML option and the in video content and quizzes stopped using the Flash option.
I reported the problem to Coursera but got a pretty unhelpful response.
From Coursera:
Sorry to hear about this, and thank you for letting us know.
We have not had an unusual amount of students reporting issues with the video playback. If its a specific Video, please let us know which one so we can check it. If its the same for all videos on this site, and the problem is slowly getting worse, it sounds like an issue with your browser or cookies and cache.
First, could you please try clearing your browser’s cookies and cache and then let me know if the problem persists? You can find instructions on how to clear various browsers here.
(Link to page which lists the following)
Google Chrome (newest)
Note: Ubuntu users may have to install the chromium-codecs-ffmpeg-extra package to make the videos work in Chromium.
Firefox (23)
Note: The video speed change feature for lecture watching is not yet supported in Firefox.
Safari (newest)
Internet Explorer (9 or newer)
Also, could you kindly tell me what happens if you try this in another browser? You can find a list of Coursera’s supported browsers here.
If those suggestions don’t work, would you mind sending me a screenshot of the problem that you encountered? This will help us better diagnose the issue.
I got the feeling from the response that they hadn't read my message properly as it is not really possible to send a screenshot of either missing quiz or audio.
Anyway, for the record, I had already tried disabling extensions etc. and have cleared cookies and cache as Coursera suggested which has not brought the HTML5 audio back.
Every now and then, I do get an in video quiz using Flash but it's only about one in ten lectures. But the problem is extremely fustrating because it means that I have to load the video lectures multiple times (depending on how many quizzes etc. there are to watch the video in Flash until it reaches a quiz then reload it in HTML5 then reload it in Flash until the next quiz etc. etc.

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Llamadude99
This morning I replied to your follow up where you told of your success and overcoming your audio issues for your Premiere Elements project. But, after I replied to your news of success, I could not find your latest post nor mine in your thread.
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I was trying different things and I went to tools to narration. I removed the mute audio before recording, then deleted the narration I previously did and then pressed undo, to bring it back and my audio returned on my video. Very strange but it worked. I wanted to thank you for taking the time to try to help me with this situation.I really appreciate it.
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18. A.T. Romano,
03-Mar-2014 07:38    in reply to Llamadude99
Llamadude99
Thanks for the update.
Later today I am going to try to get narration to cause the rest of the audio to fail. If I can, I will try what you said worked for you, that is,
I removed the mute audio before recording, then deleted the narration I previously did and then pressed undo, to bring it back and my audio returned on my video.
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