>I'm now running FF3. Sounds work properly about half the time if there is one (or more) due to be played when I first log in to the UT. While the UT is open, sounds work as expected.
>
>AFAIR UT sounds require the QuickTime player. That's the player I've got set to play the sounds.

The file format is a regular WAV file which should be played by default by Windows. Good to hear it is working.