Quicktime still not playing videos

After installing the Quicktime security update on 7/16/07 Quicktime played only audio , not video in Safari, and Q? with Foxfire (apple.com/trailers). I tried the suggestions on this forum for reinstalling Flash 9, and Qt7.2, and changing the settings in system preferences. Today tried the Perian install. Nothing has worked/changed. Will Apple be sending a fix of rthe security update?

I have a similar and possibly related problem - since installing the QT sec update, I can no longer get the QT player to play back avi files (running 10.4.10).
QT Player just hangs before the window appears ("not responding") and has to be killed using Force Quit (or Actvity Monitor).
I'm not sure if it's QT/QTP, or Flip4Mac's WMV, but I haven't seen any recent updates from F4M (for WMV, that is). But I don't think this is a Flash related stuff-up.
Additional info: the same avis won't open using MPEG Streamclip 1.8, but will run using VLC 8.8.6-bugfix.
Still, jolly annoying, at any bit-rate.

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If you're sure you've installed the latest version of Flash, take each of the following steps that you haven't already tried. After each step, relaunch Safari and test. For a "missing plug-in" error, start with Step 4.
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 ▹ System Preferences… ▹ Flash Player ▹ Advanced
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2. Triple-click the line below to select it:
/Library/Internet Plug-Ins
Right-click or control-click the highlighted text and select
Services ▹ Open
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Flash Player (failing).plugin
You may be prompted for your login password.
3. Re-download and reinstall Flash. Download it from this page:
Adobe - Install Adobe Flash Player
Never download a Flash update from anywhere else.
4. If you get a "missing plug-in" error, select
Safari ▹ Preferences... ▹ Security
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5. Select
Safari ▹ Preferences... ▹ Extensions
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Quicktime 7 not playing videos from Itunes...

So recently I noticed my Quicktime 7 has been acting strange. It used to play all my videos flawlessly... it still does, although i've noticed movies bought from the itunes store wont play anymore. When I try to open the file on QT 7 I get the black screen but then It exits out and I get the "Quicktime 7 Has Quit Unexpectedly" and I get the Kern_Protection_Failure log ( whatever that is) It's weird, before every file i tried worked perfectly, but now I cant get them to play.... Is There any fix to this or has Quicktime 7 completely stopped supporting movies/videos from Itunes? ******Oh, by the way They DO however play in Quicktime X****** I''m running 2009 macbook pro 13-inch OSX 10.6.8 and All software is up to date. It's getting frustrating. I've looked all over but no luck. Any Help Would be appreciated. Thanks

Here's what I'm getting

Quicktime problems - not playing videos.

Every video file I view on QT looks like this:
http://usera.imagecave.com/mervingiblet/Slide1.JPG
It happened when I updated it a few weeks ago. Now I cant get rid of the problem. I tried uninstall and reload but to no avail.
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What's really puzzling is that while playback of video podcasts is appallingly sluggish within iTunes (v7.3.2.6), if I browse to the relevant .m4v files and play them back in QuickTime or Media Player Classic they are as smooth as silk.
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Quicktime pro not playing video

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Safari does not play video off web pages

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Good you isolated the problem.
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Post back

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Papi625
Let me ask you this:
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Quicktime still not playing videos

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