diff --git a/src/board/UBBoardController.cpp b/src/board/UBBoardController.cpp
index 33afb520..18e56145 100644
--- a/src/board/UBBoardController.cpp
+++ b/src/board/UBBoardController.cpp
@@ -1888,10 +1888,7 @@ void UBBoardController::updateSystemScaleFactor()
     }
 
     if (mSystemScaleFactor != newScaleFactor)
-    {
         mSystemScaleFactor = newScaleFactor;
-        emit systemScaleFactorChanged(newScaleFactor);
-    }
 
     UBGraphicsScene::SceneViewState viewState = mActiveScene->viewState();
 
@@ -1956,13 +1953,8 @@ void UBBoardController::setPageSize(QSize newSize)
 void UBBoardController::notifyCache(bool visible)
 {
     if(visible)
-    {
         emit cacheEnabled();
-    }
-    else
-    {
-        emit cacheDisabled();
-    }
+    
     mCacheWidgetIsEnabled = visible;
 }
 
diff --git a/src/board/UBBoardController.h b/src/board/UBBoardController.h
index 66dd1de3..52270050 100644
--- a/src/board/UBBoardController.h
+++ b/src/board/UBBoardController.h
@@ -149,7 +149,7 @@ class UBBoardController : public UBDocumentContainer
         void setBoxing(QRect displayRect);
         void setToolbarTexts();
         static QUrl expandWidgetToTempDir(const QByteArray& pZipedData, const QString& pExtension = QString("wgt"));
-//        static QRect freeRectInGlobalPos() const {return ;}
+        
         void setPageSize(QSize newSize);
         UBBoardPaletteManager *paletteManager()
         {
@@ -239,12 +239,10 @@ class UBBoardController : public UBDocumentContainer
         void newPageAdded();
         void activeSceneChanged();
         void zoomChanged(qreal pZoomFactor);
-        void systemScaleFactorChanged(qreal pSystemScaleFactor);
         void penColorChanged();
         void controlViewportChanged();
         void backgroundChanged();
         void cacheEnabled();
-        void cacheDisabled();
         void documentReorganized(int index);
         void displayMetadata(QMap<QString, QString> metadata);
         void pageSelectionChanged(int index);
diff --git a/src/board/UBBoardPaletteManager.cpp b/src/board/UBBoardPaletteManager.cpp
index fa3eb218..cac33bde 100644
--- a/src/board/UBBoardPaletteManager.cpp
+++ b/src/board/UBBoardPaletteManager.cpp
@@ -821,8 +821,6 @@ void UBBoardPaletteManager::changeMode(eUBDockPaletteWidgetMode newMode, bool is
 
     if( !isInit )
         UBApplication::boardController->notifyPageChanged();
-
-    emit signal_changeMode(newMode);
 }
 
 void UBBoardPaletteManager::addItem(const QPixmap& pPixmap, const QPointF& pos,  qreal scaleFactor, const QUrl& sourceUrl)
@@ -970,11 +968,6 @@ void UBBoardPaletteManager::changeStylusPaletteOrientation(QVariant var)
 }
 
 
-void UBBoardPaletteManager::connectToDocumentController()
-{
-    emit connectToDocController();
-}
-
 void UBBoardPaletteManager::refreshPalettes()
 {
     mRightPalette->update();
diff --git a/src/board/UBBoardPaletteManager.h b/src/board/UBBoardPaletteManager.h
index 416a1374..5f05af11 100644
--- a/src/board/UBBoardPaletteManager.h
+++ b/src/board/UBBoardPaletteManager.h
@@ -64,7 +64,6 @@ class UBBoardPaletteManager : public QObject
         UBActionPalette *addItemPalette() {return mAddItemPalette;}
         void showVirtualKeyboard(bool show = true);
         void initPalettesPosAtStartup();
-        void connectToDocumentController();
         void refreshPalettes();
 
         UBKeyboardPalette *mKeyboardPalette;
@@ -79,10 +78,6 @@ class UBBoardPaletteManager : public QObject
         void startDownloads();
         void stopDownloads();
 
-    signals:
-        void connectToDocController();
-        void signal_changeMode(eUBDockPaletteWidgetMode newMode);
-
     public slots:
 
         void activeSceneChanged();
diff --git a/src/core/UBApplication.cpp b/src/core/UBApplication.cpp
index bcb0194c..95abad24 100644
--- a/src/core/UBApplication.cpp
+++ b/src/core/UBApplication.cpp
@@ -317,8 +317,6 @@ int UBApplication::exec(const QString& pFileToImport)
     webController = new UBWebController(mainWindow);
     documentController = new UBDocumentController(mainWindow);
 
-    boardController->paletteManager()->connectToDocumentController();
-
     UBDrawingController::drawingController()->setStylusTool((int)UBStylusTool::Pen);
 
     applicationController = new UBApplicationController(boardController->controlView(),
diff --git a/src/document/UBDocumentProxy.cpp b/src/document/UBDocumentProxy.cpp
index 05360dd7..82145959 100644
--- a/src/document/UBDocumentProxy.cpp
+++ b/src/document/UBDocumentProxy.cpp
@@ -188,8 +188,6 @@ void UBDocumentProxy::setDefaultDocumentSize(QSize pSize)
     if (defaultDocumentSize() != pSize)
     {
         setMetaData(UBSettings::documentSize, QVariant(pSize));
-        emit defaultDocumentSizeChanged();
-
         mIsModified = true;
     }
 }
diff --git a/src/document/UBDocumentProxy.h b/src/document/UBDocumentProxy.h
index 43adc634..e575375a 100644
--- a/src/document/UBDocumentProxy.h
+++ b/src/document/UBDocumentProxy.h
@@ -76,9 +76,6 @@ class UBDocumentProxy : public QObject
         int incPageCount();
         int decPageCount();
 
-    signals:
-        void defaultDocumentSizeChanged();
-
     private:
 
         void init();
diff --git a/src/domain/UBGraphicsScene.cpp b/src/domain/UBGraphicsScene.cpp
index 7b973e30..6c5f9f58 100644
--- a/src/domain/UBGraphicsScene.cpp
+++ b/src/domain/UBGraphicsScene.cpp
@@ -2075,11 +2075,9 @@ void UBGraphicsScene::setNominalSize(const QSize& pSize)
     if (nominalSize() != pSize)
     {
         mNominalSize = pSize;
-        emit pageSizeChanged();
 
         if(mDocument)
             mDocument->setDefaultDocumentSize(pSize);
-
     }
 }
 
diff --git a/src/domain/UBGraphicsScene.h b/src/domain/UBGraphicsScene.h
index 2dc79fb7..84327c82 100644
--- a/src/domain/UBGraphicsScene.h
+++ b/src/domain/UBGraphicsScene.h
@@ -339,10 +339,6 @@ public slots:
         void zoomOutMagnifier();
         void resizedMagnifier(qreal newPercent);
 
-    signals:
-
-       void pageSizeChanged();
-
     protected:
 
         UBGraphicsPolygonItem* lineToPolygonItem(const QLineF& pLine, const qreal& pWidth);
diff --git a/src/gui/UBCachePropertiesWidget.cpp b/src/gui/UBCachePropertiesWidget.cpp
index f97043bf..5bdcdc3f 100644
--- a/src/gui/UBCachePropertiesWidget.cpp
+++ b/src/gui/UBCachePropertiesWidget.cpp
@@ -241,11 +241,6 @@ void UBCachePropertiesWidget::onCloseClicked()
         UBApplication::boardController->activeScene()->removeItem(mpCurrentCache);
         mpCurrentCache = NULL;
 
-        if(mCaches.empty())
-        {
-            emit cacheListEmpty();
-        }
-
         emit hideTab(this);
     }
 }
diff --git a/src/gui/UBCachePropertiesWidget.h b/src/gui/UBCachePropertiesWidget.h
index 0660576a..7a6abac4 100644
--- a/src/gui/UBCachePropertiesWidget.h
+++ b/src/gui/UBCachePropertiesWidget.h
@@ -52,9 +52,6 @@ public:
 public slots:
     void updateCurrentCache();
 
-signals:
-    void cacheListEmpty();
-
 private slots:
     void onCloseClicked();
     void updateCacheColor(QColor color);