Index: libs/libmyth/audiooutputbase.cpp
===================================================================
--- libs/libmyth/audiooutputbase.cpp.orig
+++ libs/libmyth/audiooutputbase.cpp
@@ -292,6 +292,7 @@ bool AudioOutputBase::ToggleUpmix(void)
         return false;
 
     upmix_default = !upmix_default;
+    reset_active.Ref();
 
     const AudioSettings settings(format, source_channels, codec,
                                  source_samplerate, passthru);