I thought the extreme "fix" (going back to the previous version of Quicktime) was rather time consuming:
In these dire cases, when our previously mentioned fixes don't work, your best bet may be a downgrade to QuickTime 7.3, as described below:
Downgrading to QuickTime 7.3 First, make a backup of your current Mac OS X installation with QuickTime 7.4 applied, problematic as it may be. If there is an issue along the way, your valuable data will be safely intact in its current form.
Next, you'll need to perform an Archive and Install process to remove all of the QuickTime update's (and potentially problem-causing) components, and replace them with the components of the older release. Unfortunately, this means you will lose some system settings and some or all third-party system add-ons.
To begin the process, insert your Mac OS X CD or DVD. Restart your machine and hold down the "C" key to boot from the newly inserted disc. Follow the on-screen instructions, and after accepting the license agreement, click "Options." Select "Archive and Install," and check the "Preserve User and Network Settings" option if you'd like to do so.
After the installation process is complete, you will be left with an earlier Mac OS X system that (hopefully) does not suffer from the problems generated by QuickTime 7.4.
Next, download and install the latest version of your OS (Leopard [10.5.1], Tiger [10.4.11], or Panther [10.3.9]) from Apple's download page.
Finally, download and install QuickTime 7.3 from one of the following links:
* QuickTime 7.3.1 for Leopard [10.5.1]
* QuickTime 7.3.1 for Tiger [10.4.11]
* QuickTime 7.3.1 for Panther [10.3.9]
http://www.macfixit.com/article.php?story=2008011811151896I also saw that the video part of SKYPE had been disabled because of security concerns by the company. I don't know if anyone here uses it but our experimental school is big on remote tutoring using it! I realize this is a Windows problem but I thought it might apply to some out there.