27" 2010 iMac - loss of sound in youtube after Lion 10.7.1 upgrade

Hello
This is very weird but when I go to youtube with Safari under Lion I will sometimes (not always) have no sound when the videos play.
Some are perfect but some are silent.
I am a Mac newbie and don't know how to proceed.
Could it be Flash related?
Any help will be appreciated.
TIA
Mark

Can anyone help??

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http://support.apple.com/en-us/TS5357
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
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