Sound only works with Netflix via Mini DisplayPort

I recently ordered a Mini DisplayPort to HDMI Adapter  (http://www.amazon.com/gp/product/B007DNG9DY/ref=oh_details_o05_s00_i00) for use with my Macbook Pro (purchased in 2011). I followed all of the setup instructions for display and sound (in both system preferences and Audio Midi). It seems that the audio is working only on Netflix. I have tried watching videos on other websites like YouTube and ABC, and there is video but no sound. Sound also works for video files that are on my computer. 
Does anyone know why I would not have any sound only on certain websites? Is there a way to fix this?

I had this exact same issue with my mini and a Toshiba 1080p TV.
The reason is pretty technical and involves the EDID signal being lost between TV and Mini. (I think the TV can't re-acquire the signal from the mini)
The only way I found to solve it was to buy one of these:
http://www.gefen.com/kvm/dproduct.jsp?prod_id=4714
(Gefen DVI Detective)
Once setup it stores the EDID so that the TV always displays the mini's video signal.
It's easy to setup and works fine for me (I've used it connected directly to my TV and through a HDMI switch). Only problem is the price for something that should already work.

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