The problem is that artsd, kde's own personal sound system, wants complete control of your sound card. open up a console and do this:
Code:
lsof /dev/dsp
kill -9 (process id of artsd)
If you want to get rid of it, rather than trying to remove it from config files, I just did found it with locate and did a chmod 000 artsd. This may be a rather hackish solution, but it works. I'm kind of wondering whether it's a good idea myself...