Apple's newest version of Mac OS X (Snow Leopard) does not provide easy access to the settings, so a trickier solution is necessary.
There is a way to access the QuickTime preferences through the command line, using "qtdefaults", a command line program that comes with Snow Leopard. However, using it to set defaults doesn't necessary do the right thing. Somehow, old preferences lying around cause QuickTime to get confused. So you have to manually delete the preferences:
- Quit all QuickTime Player apps that may currently be running (QuickTime Player or QuickTime Player 7).
- Launch Terminal (found in /Applications/Utilities)
- In Terminal, and type "rm ~/Library/Preferences/*[Qq]uick[Tt]ime*", hit return.
- In Terminal, type "qtdefaults reset TransportSettings", hit return.
- Launch QuickTime Player, then immediately quit it.
- In Terminal, and type "rm ~/Library/Preferences/*[Qq]uick[Tt]ime*" again, hit return.
- In Terminal, type "qtdefaults reset TransportSettings" again, hit return.
In the movie window, left click the down arrow or right click anywhere in the movie window.
Next, select "Plug-in Settings..." in the context menu that opens.
Finally, under the Streaming tab, ensure that Streaming Speed is set to "Automatic". Close the settings window and reload the transcript you wish to view.
If you continue to have difficulty playing media, you may need to manually set your connection speed. Follow the above steps, but instead of setting Streaming Speed to "Automatic", try "256 Kbps DSL/Cable" or lower. Continue testing different streaming speeds until the media is able to be played smoothly.