Mid 2012 Mac Pro OS X 10.9.2 Safari 7.0.3
No audio from video content like this video-v2-zcr.php with Flash Player 188.8.131.52 Removed the plugin from the internet plugins folder and audio returned.
Gotta be something on your system...
Audio played just fine on my Mini.
Have you tried resetting Safari?
Thanks for your suggestion, Reseting Safari did the trick.
Retrieving data ...