Some readers report that all was working fine until just a few days ago.
The problem extends to both Mac OS X 10.x and Mac OS 9.x. If so, copy the newer version to your browser's Plug-ins folder. Some users report not having this problem after updating to 9.2.1 or 10.1, while others still see it. Currently, we have no problem playing any of the movies on the Apple site, with either 9.2.1 or 10.1 running. We suspect that it has more to do with how QuickTime was last updated than how the OS was updated.