go to http://www.apple.com/aperture/resources/tutorial/. after the intro QuickTime loads, click on one of the Photo Management, Image Processing or Output links. nothing happens. the links work in Opera.
I cannot reproduce this problem in stock 10.4.5 Safari or ToT with QuickTime 7.0.4.
The description sounds similar to bug 8658.
This page has changed, and the movie doesn't have links anymore. Since the bug could never be confirmed, I'm closing it as INVALID.