QuickTime 7.3.1, I get the question mark?

Question

Hello everybody in the forum.
I have a problem with browsers when I see the trailers of the movies page apple, I get the question mark over QuickTime.
Help Please
Greetings!

Answer 1

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.
For some reason apple removed the option in the MIME settings to disable Flash Media. I think they were looking to remove the option since QuickTime wont play Flash Media. However, I looked at my com.apple.quicktime.plugin.plist in the Plist Editor that comes with Developer and discovered that the Shockwave Flash was set to "true." So, when upgrading to 7.3 somehow it not only kept my old prefs, but it enabled that option (which I never enabled) in my prefs, which is no longer an option in the User Interface Prefs. So I tried changing it to "False" but when I opened a browser session and went to a page with Flash Media, QuickTime changed it back to "True." I tried deleting the file and QuickTime recreated it with the same settings. I later found out deleting the com.apple.quicktimeplayer.plist and the QuickTime Preferences files and rebooting would fix the problem. One of these files was causing the recreation of the com.apple.quicktime.plugin.plist file. Deleteing all three of these files should fix the problem.
Location:
Users/<your user name here>/Library/Prefernces/
com.apple.quicktime.plugin.plist
com.apple.quicktimeplayer.plist
QuickTime Preferences
trash these and reboot
*QuickTime will recreate uncorrupted prefs on first launch
You could also compile this in Script Editor and run it (it targets and deletes the files and reboots your machine) Script editor is in Applications/AppleScript/.
Copy text below:
PLEASE NOTE:
This script was created to simply remove the preferences associated with the QuickTime Plugin and QuickTime Player to remove the pesky QT question mark and restore Flash playback in browsers. It is intended to fix the problem on PPC machines where when updating to QuickTime 7.3 it carries over bad and/or corrupts the preference files associated with QuickTime. These preferences will be recreated on reboot. **You need to be logged into a user account with administrative access in order to use this script**
property the_list : {}
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/"
--DELETES THESE ITEMS---
set QTPluginPrefs to user_account & "com.apple.quicktime.plugin.preferences.plist'"
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
repeat with afile in the_list
tell application "Finder"
do shell script afile
end tell
end repeat
--PROMPTS A REBOOT---
display dialog "Reboot is required! Reboot now?" buttons {"OK", "Cancel"} default button "OK" with icon caution
if button returned of result is "OK" then
tell application "Finder" to restart
else
quit
end if
end run