Safari won't play audio or video without stutters.

Console shows sandboxd - deny file-read-data errors at /Library/ScriptingAdditions as well as the same folder in my user directory. The error repeats non-stop (even when Safari is idle), approximately 50 messages per minute. PlugInProcess numbers change from 408 to 477 to 483.
11/30/13 12:44:03.424 PM sandboxd: ([483]) PluginProcess(483) deny file-read-data /Library/ScriptingAdditions
11/30/13 12:44:03.426 PM sandboxd: ([483]) PluginProcess(483) deny file-read-data /Users/(myusername)/Library/ScriptingAdditions
I use a few third party extensions but I disabled them, rebuilt permissions, checked for disk errors, nothing seems to help. Don't want to completely reset Safari unless that's the next natural step (if it might help).
Also I tried the same videos/audio in Chrome - no problems, no such entries in Console.
I'm on an iMac 27" intel core i5, 12gb memory, running Lion 10.7.5.
Can anyone help? Thank you.

Hi...
MacBook Pro, Mac OS X (10.7.3)  < your profilel
I have a MacBook Pro running all the latest software
If your profile is correct, click the Apple menu icon top left in your screen. From the drop down menu click Software Update. The most recent Lion version available is v10.7.4 and Safari 5.1.7
For troubleshooting Flash.
Quit Safari.
Open System Preferences > Flash Player then select the Storage tab. Click: Delete All
Now uninstall the Flash plugin then reinstall new >  Troubleshoot Flash Player | Mac OS
Launch Safari From your Safari menu bar click Safari > Empty Cache
Now try a video.
BTW... if you have the ClickToFlash extension installed, that can prevent Flash based video from streaming. It can also be installed as a plugin in /Library/Internet-Plug-Ins.
And check to see if Safari is running in 32 bit mode. Right or control click the Safari icon in your Applications folder then click Get Info. If the box next to:  Open in 32 bit mode  is selected, deselect, quit then relaunch Safari.
Spend $49 for what? QuickTime is pre installed on your Mac. If you are using HTML5, that can prevent Flash content from streaming.
For QuickTime. Check Safari > Preferences > Extensions. If you have any installed, turn that OFF, quit then relaunch Safari. Try a QT video.
Not sure if this will work for recent versions of Safari for mp3, but won't hurt to try >  http://www.kalvster.com/macintosh/save-download-mp3-files-in-macintosh-safari.ht ml

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