Fix Quicktime issue in Tiger
I've had this trouble with Quicktime and Safari since I installed Tiger. Often, when trying to view a Quicktime movie on a webpage (not all the time, but just enough to make me wonder what was going on), I'd get the icon at right. Usually, opening the same URL in Firefox would resolve the issue. That is to say, the movie played just fine in Firefox. I found this kind of frustrating, but not enough to try and work out an answer. Luckily, Mr. Barrett did the hard part for me.
To solve this problem in most cases, he writes, follow these four steps: First, Quit Safari. Next, navigate to /Library/Internet Plug-ins/. Then, find the file called QuickTime Plugin.webplugin and move it to the desktop (or delete it if you're confident). Finally, re-launch Safari and return to the troublesome URL. The movie should now play as expected. Worked for me! Thanks, Mr. Barrett!
[Via Mr. Barret.com]
