For the audio freeze, try uninstalling arts if you have it. That's what seems to cause the freeze on my box. I also get output on the terminal saying "unable to create mcop directory."
Hi,
I'm running FC4 and had the same issue with the mcop directory message. This was introduced by either arts-1.5.0-0.1.fc4 or kdelibs-3.5.0-0.1.fc4 (or both :-).
It was fixed by the latest updates (*-0.2.fc4) of these packages.
Paul.