Since the update to 12.04, there's been a problem specifically related to audio/video playback in Google Chrome.
The problem only affected the Google version but not the Chromium nor the Firefox Browsers.
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As of today, this happened once again, and I solved it with the same method, so this could apply to any version. It's not clear (at least for me) if this is a bug related to Chrome updates or something else. If someone could clarify this, I would be grateful. On the other hand, if you go down to this road, take it as a temporary solution.
Here's what I did.
chrome://plugins/and look where the flash plugin was. I saw that there were 3 different plugins installed.
/usr/lib/flashplugin-installer/libflashplayer.so(the "original" flash plugin, and not the integrated chrome version).
I'm no expert, but I think there are some problems related to the integrated version, so untill a new version is released, I'll stick to the "original" plugin.
Hope it works for you!