Apple on Wednesday night updated three of its key media applications for Mac OS X to mend their compatibility and apply bug fixes:
This release is recommended for all QuickTime 7 users. QuickTime 7.4.5 includes fixes that enhance reliability, improve compatibility with third-party applications, and address security issues.

iTunes 7.6.2 provides bug fixes to improve stability and performance.

Version 2.1.3: This Front Row update provides improved iTunes 7.6.2 compatibility.

If these updates are applicable to your system, they will be found in Software Update.