>>I have downgraded to IE4.0 and the sounds are back. I will upgrade to IE 5.5 again and see if they stay.
>>
>>This same thing happened to me 6 months ago.
>
>There might be something wrong during the install.

I have done the install and uninstallseveral times now. The UT sounds don't work on NT4 with IE5.01 or higher. Ken has confirmed the behavior on Win2000. Windows 98 and 95 are fine.

P.S. Ken, pardon the CC.