Thanks Mike... Tried that and now I'm getting no audio on YouTube videos and my iTunes no longer works... Any idea what might be going on? This is a 2007 silver intel Mac.
iTunes uses QuickTime NOT Flash Player. TOTALLY unrelated. However...
Safari and iTunes BOTH depend on your AudioMIDI settings for output to be correct. Third party apps can reset this, and it kills audio in Safari, iTunes, QuickTime and several other places.
You'll find the AudioMIDI Setup in your Applications/Utilities folder
It needs to be 44100Hz or 48000Hz or things will go silent.
Flash Player doesn't have anything in it to alter AudioMIDI settings so if they changed, it was from something else.
Thanks again. My audio interface just needed a reboot. All fine now.