Apple has updated QuickTime to 7.4.1 which they say fixes security issues and “improves compatibility with third-party applications.” They recommend this update to all QuickTime users. Ars Technica is reporting that this update also fixes some AfterEffects rendering issues.

This update is available for Mac OS X Leopard (10.5), Mac OS X Tiger (10.4), Mac OS X Panther (10.3) and Windows.

Run Software Update or by clicking one of the correct link above to download the software installer package from Apple.