Freezing with iTunes 7.6.1, thumping sound,especially during video playback

Hi,
Has anyone noticed a decrease in system reliability after upgrading to iTunes 7.6.1, especially during video/videopodcast playback in iTunes on their MacBook Pro's?
Specifically, the entire system locks up. Reminds me of the days of OS 7.5.5 when the mouse cursor freezes, keyboard stops responding. The only way to proceed is by holding down the power button.
This has occurred about 4 times now. The trackpad will become unresponsive, keyboard buttons such as caplocks and nu lock will be unresponsive too. Most interesting is that the sound output will loop, usually a short bit of the last audio played back over iTunes.
Videos which have triggered this:
- Podcast: Diggnation
- Podcast: ABC World News Now
- YouTube video's converted by Tooble
Here's a video I recorded showing the thumping noise. It sounds like the last audio dump before the crash looped. It's not coming from the hard drive. Definitely from the speakers.
http://www.youtube.com/watch?v=wzOCcINoClg
In the video you see I had World of Warcraft up, but I don't think it is the problem, because this kind of crash has occurred while using other programs.
Details:
iTunes 7.6.1
QuickTime 7.4.1
Mac OS X 10.4.11
2.2 Ghz (MacBookPro3,1)
4GB RAM
External second monitor attached: eMachines 15" LCD
Prefrence panes additions: Application Enhancer, Divx, FinderPop, Flip4Mac WMV, Perian, Teleport, WindowShade X.
Have NOT installed Security Update 2008-001 OR AirPort Utility 5.3.1 pending user problem reports.
I never had such a complete system freeze until about the time I updated to iTunes 7.6.1. Repaired disk, permissions, cleaned up virtual memory, cache's using AppleJack.
Thanks, just want to see if this is an isolated problem.

First, create a new user account and see if you can replicate the problem on that account.
If so, start by killing all the running daemons that aren't OS X-native apps. In other words, Window Shade X, Application Enhancer, divx, etc. Quit all that junk and use Activity Monitor to make sure those apps aren't running background tasks. I'd be willing to bet that Application Enhancer is the culprit.
See if that solves the problem. If so, you can add the applications back one by one until you find the one that's causing problems.

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