Video and audio sync when viewing clips online

When viewing clips, like on youtube, the graphics start playing, however there is no sound, only after a few seconds the graphics freeze and the sound that was missing starts playing and the graphics resume when they're in sync again.
Also when I pause a video and click play the clip will not resume and I have to click the "time bar" and then it will play.
My 13 MB Pro starts furiously blowing the cooling fan and consuming battery life when viewing clips on most video sites.
How can I fix these things?
This already happened before upgrading to Lion, btw.

Are you capturing this thru the LS? and what is the format you are digitizing? DV? or uncompressed? Would be best I'd think if you don't capture audio and video as separate files too. That leads to problems especially with DV captures.
How are you monitoring the audio and video? all from computer or? You could be in sync and not know it if you are using computer speakers for monitoring audio when watching video externally for example.
If you monitor both from the computer and it is in sync, but not when you record to video, I'd suggest that you export a self contained movie of this material and import that for the print to the beta... I'll wager that will keep your sync. If this doesn't help, might want to post this in the AJA KONA forum at http://www.creativecow.net Might be something to do with your LS, not sure but do have the latest drivers installed on it...
Jerry

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    Menu ID                                  : 1 (0x1)
    Format                                   : MPEG Video
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    Format profile                           : [email protected]
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    Format settings, Matrix                  : Default
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    Duration                                 : 55mn 32s
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    Format                                   : MPEG Audio
    Format version                           : Version 1
    Format profile                           : Layer 2
    Codec ID                                 : 4
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    Channel(s)                               : 2 channels
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    Menu ID                                  : 1 (0x1)
    Duration                                 : 55mn 32s
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