Recently sound stopped working in all the Xine-based applications. I get the error: the audio device is unavailable. I am using latest Debian Testing with KDE. I haven't been fiddling with the configuration recently, just doing the updates. 
Audio stopped working in Xine in Debian
debian;audio
Xine is not being developed anymore. Change to another phonon-backend.I.E. after that Xine problem you've have described, I'm running phonon-backend-vlc flawlessly.