QuickTime in Safari cannot play video after upgrading to iTunes 10.2

After upgrading to iTunes 10.2 and QuickTime 10 on my MacBook Pro, the latest Quicktime version embedded in Safari is behaving strangely. When I want to play video on certain websites like " http://www.lynda.com/Aperture-3-tutorials/essential-training/59221-2.html ", the Quicktime logo on Safari browser appears and just sits there with sound only. I tried it on Firefox, the video can only be played on the lower part of my suddenly splitted screen, there is an "error" message on a Quicktime logo background.
Could anybody help me solve the problem. By the way, all these videos can be played normally on my Windows 7 desktop using both Firefox and Safari for Windows.

To make the matter more weird, the QuickTime plays normally on my Safari after I log out and switch to the administrator account of the MacBook Pro. When I change back to a normal account, the QuickTime error takes place again. It seems there must be something I configured wrongly.

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