Amarok refuses to play *.ogg files

Amarok refuses to play *.ogg files

After recent upgrade to Amarok 2.1 it refuses to play *.ogg files. When I hit play, it blinks for a second and stops. No sound is generated. *.mp3 do play (although they stop after one song - see my other question). How can I fix it? It used to work with the old version (1.something).