A few weeks ago I wrote about a problem that I was having with Amarok. The player was not able to load the xine audio drivers. Since then I have figured out why this was. I often run Windows in a Virtual Machine (VM) using VMware and so VMware was using the drivers. The fix? Either shut down the VM or disable the audio.
Here is how to disable the sound adapter without shutting down the VM:
From the menu at the top of the screen select VM >> Removable Devices >> Sound Adapter >> Disconnect
You may have to restart Amarok to get it to load the drivers.
See Amarok Problems