Can't play quicktime trailers, keep getting a question mark?

My mac started acting very strange 2 days ago. I can't play any trailers, the box opens and instead of the trailer playing, I get a question mark. this never happened. Please help

I dont know if its aloud to talk about modding quicktime but this worked for me.
1) Duplicate your quicktime and call the copy "Quicktime_Backup" (in case something goes wrong or when a new update comes out).
2) On the original file, right click, show content and navigate to "Content/Resources/"
3) delete all language-folders except the english one (example: Dutch.Iproj).
4) restart Quicktime and safari, and you will be able to watch the HD trailers now.
Note: Movies like the Small, Medium and large still wont play but then you maybe need to do the same with safari so you can play the movies within safari but im not sure about that.

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I struggled with this issue for a while. One of my false successes was re-installing Flash Player which worked until I closed my browser and reopened it.
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on run
display dialog "Are you sure you want to delete yor QuickTime Preferences?" with icon caution
set CurrentUser to do shell script "whoami"
set user_account to "rm '/Users/" & CurrentUser & "/Library/Preferences/"
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set the_list to the_list & QTPluginPrefs
set QTPlayerPrefs to user_account & "com.apple.quicktimeplayer.plist'"
set the_list to the_list & QTPlayerPrefs
set QT_Prefs to user_account & "QuickTime Preferences'"
set the_list to the_list & QT_Prefs
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do shell script afile
end tell
end repeat
--PROMPTS A REBOOT---
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quit
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end run

Can't play quicktime trailers, keep getting a question mark?

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