Index: mdwslider.cpp
===================================================================
--- mdwslider.cpp       (revision 732221)
+++ mdwslider.cpp       (working copy)
@@ -823,7 +823,7 @@

    // update mute

-   if( m_iconLabelSimple != 0 ) {
+   if( m_qcb != 0 ) {
 /*
       m_iconLabelSimple->blockSignals( true );
       m_iconLabelSimple->setChecked( !m_mixdevice->isMuted() );