First update your system after do a restart. If still doesn’t work search for pulseaudio in yast and remove all packages related to pulseaudio.
Good luck.
Hmmm … I’m running openSUSE-11.1 with KDE-3.5.10. I have pulse audio installed (I have not removed any of the default pulse apps). A few minutes ago I played a video with VLC (surround sound) and an audio with amarok. Both at the same time. No problems.
Possibly a gnome desktop interface with audio problem?
Right I can confirm that after updating to the latest packages pulseaudio should work - sometimes KDE4 informs me that the playback won’t work and it’s falling back to something different, and I need to restart Amarok, but actually it’s working.
With a freshly installed system pusleaudio is very problematic (i remember there were a lot of post about sound issues right after the 11.1 release) - the easiest way to solve this was uninstalling all pulseaudio modules, this is why I suggested it.
ps.: actually I didn’t realized yet, why they included a problematic module like this one as default sound system.