diff --git a/src/app/qgslabelinggui.cpp b/src/app/qgslabelinggui.cpp
index 6c030e60760..e12d65fb1c7 100644
--- a/src/app/qgslabelinggui.cpp
+++ b/src/app/qgslabelinggui.cpp
@@ -48,7 +48,8 @@
 QgsLabelingGui::QgsLabelingGui( QgsPalLabeling* lbl, QgsVectorLayer* layer, QgsMapCanvas* mapCanvas, QWidget* parent )
     : QWidget( parent ), mLBL( lbl ), mLayer( layer ), mMapCanvas( mapCanvas )
 {
-  if ( !layer ) return;
+  if ( !layer )
+    return;
 
   setupUi( this );
   mCharDlg = new QgsCharacterSelectorDialog( this );
@@ -111,8 +112,8 @@ QgsLabelingGui::QgsLabelingGui( QgsPalLabeling* lbl, QgsVectorLayer* layer, QgsM
       break;
     case QGis::NoGeometry:
       break;
-    default:
-      Q_ASSERT( 0 && "NOOOO!" );
+    case QGis::UnknownGeometry:
+      qFatal( "unknown geometry type unexpected" );
   }
 
   // show/hide options based upon geometry type
@@ -281,8 +282,6 @@ void QgsLabelingGui::init()
     case QgsPalLayerSettings::Free:
       radPolygonFree->setChecked( true );
       break;
-    default:
-      Q_ASSERT( 0 && "NOOO!" );
   }
 
   if ( lyr.placement == QgsPalLayerSettings::Line || lyr.placement == QgsPalLayerSettings::Curved )
@@ -366,9 +365,9 @@ void QgsLabelingGui::init()
   updateFont( mRefFont );
 
   // show 'font not found' if substitution has occurred (should come after updateFont())
+  mFontMissingLabel->setVisible( !lyr.mTextFontFound );
   if ( !lyr.mTextFontFound )
   {
-    mFontMissingLabel->setVisible( true );
     QString missingTxt = tr( "%1 not found. Default substituted." );
     QString txtPrepend = tr( "Chosen font" );
     if ( !lyr.mTextFontFamily.isEmpty() )
@@ -565,7 +564,9 @@ QgsPalLayerSettings QgsLabelingGui::layerSettings()
     lyr.placement = QgsPalLayerSettings::Free;
   }
   else
-    Q_ASSERT( 0 && "NOOO!" );
+  {
+    qFatal( "Invalid settings" );
+  }
 
 
   lyr.textColor = btnTextColor->color();
@@ -1048,7 +1049,7 @@ void QgsLabelingGui::updateFont( QFont font )
   }
 
   // test if font is actually available
-  mFontMissingLabel->setVisible( QgsFontUtils::fontMatchOnSystem( mRefFont ) );
+  mFontMissingLabel->setVisible( !QgsFontUtils::fontMatchOnSystem( mRefFont ) );
 
   mDirectSymbLeftLineEdit->setFont( mRefFont );
   mDirectSymbRightLineEdit->setFont( mRefFont );
@@ -1115,7 +1116,8 @@ void QgsLabelingGui::updatePreview()
   }
   else // in points
   {
-    previewFont.setPointSize( fontSize );
+    if ( fontSize > 0 )
+      previewFont.setPointSize( fontSize );
     mPreviewSizeSlider->setEnabled( false );
     grpboxtitle = sampleTxt;
 
diff --git a/src/core/qgsfontutils.cpp b/src/core/qgsfontutils.cpp
index d1d4f70e730..96f34872e3a 100644
--- a/src/core/qgsfontutils.cpp
+++ b/src/core/qgsfontutils.cpp
@@ -53,7 +53,8 @@ bool QgsFontUtils::fontFamilyMatchOnSystem( const QString& family, QString* chos
       {
         // full 'family [foundry]' strings have to match
         *match = ( *it == family );
-        if ( match ) { break; }
+        if ( *match )
+          break;
       }
       else
       {
diff --git a/src/core/qgspallabeling.cpp b/src/core/qgspallabeling.cpp
index e8150591fe3..a13e975d896 100644
--- a/src/core/qgspallabeling.cpp
+++ b/src/core/qgspallabeling.cpp
@@ -1778,6 +1778,7 @@ void QgsPalLayerSettings::registerFeature( QgsVectorLayer* layer,  QgsFeature& f
     }
     catch ( QgsCsException &cse )
     {
+      Q_UNUSED( cse );
       QgsDebugMsgLevel( QString( "Ignoring feature %1 due transformation exception" ).arg( f.id() ), 4 );
       return;
     }
@@ -2085,6 +2086,7 @@ void QgsPalLayerSettings::registerFeature( QgsVectorLayer* layer,  QgsFeature& f
           }
           catch ( QgsCsException &e )
           {
+            Q_UNUSED( e );
             QgsDebugMsgLevel( QString( "Ignoring feature %1 due transformation exception on data-defined position" ).arg( f.id() ), 4 );
             return;
           }
diff --git a/src/ui/qgslabelingguibase.ui b/src/ui/qgslabelingguibase.ui
index aa3ce2d095f..326ddd03d7a 100644
--- a/src/ui/qgslabelingguibase.ui
+++ b/src/ui/qgslabelingguibase.ui
@@ -1287,7 +1287,7 @@
 font-style: italic;</string>
                               </property>
                               <property name="text">
-                               <string notr="true">missing font text</string>
+                               <string>Font is missing.</string>
                               </property>
                               <property name="alignment">
                                <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>