Apple has just posted through the Software Update utility, an update for QuickTime to version 7.0.1. The update weights 26.6MB. Here are the changes:

QuickTime 7.0.1 provides several important bug fixes, a security enhancement, and improved compatibility with Final Cut Studio. This update is recommended for all QuickTime 7 users. For detailed information on the security enhancement, please visit this website:

http://www.info.apple.com/kbnum/n61798