It all works for me...
maybe reinstall flash, but first try to clear cookies and all...
Works here too. Do sounds work all together? If not, it could be something with your speakers.
I have a problem with sound lagging sometimes, but it's not only with Flash so I guess my computer's not working right, even though I just had a different problem on it fixed :P
See my news post with medal hunting links and tools. I made a program NGMedals that finds your statistics and unearned medals.
There is also a browser script.
Maintainer of the Top Medal Point Users List and API Mod - feel free to PM with any issues.