I have the sounds turned on, but they don't play at all in Chrome.  They play fine other browsers IE or FF) just not in Chrome.  I'm guessing it's a script thing particular to Chrome, because if I go to the /images/timerbeep.swf page directly then I see the screen flash and hear the alert sound.

Since Chrome is quickly becoming the dominant browser, any chance you could look into fixing that? 

It has something to do with Chrome not MR. I ask about this issue as well but from the admins understanding they have done all that they can. It is on Chrome. I have sent an error message to them but they never got back to me.

The sounds don't play on mine I'm using good ol' IE.

I use chrome and the sounds work fine for me. Although I find if I've music on or I'm watching something online and have this in the back ground I don't notice the sounds, but that pop is still there when I've nothing on in the background.

I use Chrome as well (on a mac) and the sounds play for me. Message me and I can help you