diff --git a/YACReader/comic.cpp b/YACReader/comic.cpp
index b9675039..30f62742 100644
--- a/YACReader/comic.cpp
+++ b/YACReader/comic.cpp
@@ -27,7 +27,7 @@ Comic::Comic(const QString & pathFile, int atPage )
 //-----------------------------------------------------------------------------
 Comic::~Comic()
 {
-	delete bm; //TODO safe delete
+
 }
 //-----------------------------------------------------------------------------
 void Comic::setup()
@@ -188,7 +188,7 @@ FileComic::FileComic(const QString & path, int atPage )
 
 FileComic::~FileComic()
 {
-	//Comic::~Comic();
+	_pages.clear();
 }
 
 bool FileComic::load(const QString & path, int atPage)
diff --git a/YACReader/goto_flow.cpp b/YACReader/goto_flow.cpp
index c406f6cb..dbe97f3f 100644
--- a/YACReader/goto_flow.cpp
+++ b/YACReader/goto_flow.cpp
@@ -29,7 +29,7 @@
 /*#define WIDTH 126
 #define HEIGHT 200*/
 
-QMutex mutexGoToFlow;
+
 
 
 
@@ -39,7 +39,7 @@ GoToFlow::GoToFlow(QWidget *parent,FlowType flowType)
 	updateTimer = new QTimer;
 	connect(updateTimer, SIGNAL(timeout()), this, SLOT(updateImageData()));
 
-	worker = new PageLoader;
+	worker = new PageLoader(&mutexGoToFlow);
 
 
 	flow = new YACReaderFlow(this,flowType);
@@ -70,7 +70,12 @@ GoToFlow::GoToFlow(QWidget *parent,FlowType flowType)
 	
 
 }
-
+GoToFlow::~GoToFlow()
+{
+	delete flow;
+	delete updateTimer;
+	worker->deleteLater();
+}
 
 void GoToFlow::centerSlide(int slide)
 {
@@ -97,7 +102,7 @@ void GoToFlow::setNumSlides(unsigned int slides)
 
 	toolBar->setTop(slides);
 
-	SlideInitializer * si = new SlideInitializer(flow,slides);
+	SlideInitializer * si = new SlideInitializer(&mutexGoToFlow,flow,slides);
 
 	imagesLoaded.clear();
 	imagesLoaded.fill(false,slides);
@@ -235,37 +240,37 @@ void GoToFlow::updateConfig(QSettings * settings)
 //-----------------------------------------------------------------------------
 //SlideInitializer
 //-----------------------------------------------------------------------------
-SlideInitializer::SlideInitializer(PictureFlow * flow,int slides)
-:QThread(),_flow(flow),_slides(slides)		
+SlideInitializer::SlideInitializer(QMutex * m,PictureFlow * flow,int slides)
+:QThread(),mutex(m),_flow(flow),_slides(slides)		
 {
 
 }
 void SlideInitializer::run()
 {
-	mutexGoToFlow.lock();
+	mutex->lock();
 
 	_flow->clear();
 	for(int i=0;i<_slides;i++)
 		_flow->addSlide(QImage());
 	_flow->setCenterIndex(0);
 
-	mutexGoToFlow.unlock();
+	mutex->unlock();
 }
 //-----------------------------------------------------------------------------
 //PageLoader
 //-----------------------------------------------------------------------------
 
 
-PageLoader::PageLoader(): 
-QThread(), restart(false), working(false), idx(-1)
+PageLoader::PageLoader(QMutex * m): 
+QThread(),mutex(m), restart(false), working(false), idx(-1)
 {
 }
 
 PageLoader::~PageLoader()
 {
-	mutexGoToFlow.lock();
+	mutex->lock();
 	condition.wakeOne();
-	mutexGoToFlow.unlock();
+	mutex->unlock();
 	wait();
 }
 
@@ -276,12 +281,12 @@ bool PageLoader::busy() const
 
 void PageLoader::generate(int index, QSize size,const QByteArray & rImage)
 {
-	mutexGoToFlow.lock();
+	mutex->lock();
 	this->idx = index;
 	//this->img = QImage();
 	this->size = size;
 	this->rawImage = rImage;
-	mutexGoToFlow.unlock();
+	mutex->unlock();
 
 	if (!isRunning())
 		start();
@@ -298,7 +303,7 @@ void PageLoader::run()
 	for(;;)
 	{
 		// copy necessary data
-		mutexGoToFlow.lock();
+		mutex->lock();
 		this->working = true;
 		//int idx = this->idx;
 
@@ -308,18 +313,18 @@ void PageLoader::run()
 		// let everyone knows it is ready
 		image = image.scaled(this->size,Qt::KeepAspectRatio,Qt::SmoothTransformation);
 
-		mutexGoToFlow.unlock();
+		mutex->unlock();
 
-		mutexGoToFlow.lock();
+		mutex->lock();
 		this->working = false;
 		this->img = image;
-		mutexGoToFlow.unlock();
+		mutex->unlock();
 
 		// put to sleep
-		mutexGoToFlow.lock();
+		mutex->lock();
 		if (!this->restart)
-			condition.wait(&mutexGoToFlow);
+			condition.wait(mutex);
 		restart = false;
-		mutexGoToFlow.unlock();
+		mutex->unlock();
 	}
 }
diff --git a/YACReader/goto_flow.h b/YACReader/goto_flow.h
index 7fb101b2..96793772 100644
--- a/YACReader/goto_flow.h
+++ b/YACReader/goto_flow.h
@@ -5,6 +5,7 @@
 #include <QThread>
 
 #include <QWaitCondition>
+#include <QMutex>
 
 class QLineEdit;
 class QPushButton;
@@ -28,6 +29,7 @@ class GoToFlow : public GoToFlowWidget
 	Q_OBJECT
 public:
 	GoToFlow(QWidget* parent = 0,FlowType flowType = CoverFlowLike);
+	~GoToFlow();
 	bool ready; //comic is ready for read.
 	bool eventFilter(QObject *target, QEvent *event);
 private:
@@ -43,6 +45,7 @@ private:
 	QTimer* updateTimer;
 	PageLoader* worker;
 	virtual void wheelEvent(QWheelEvent * event);
+	QMutex mutexGoToFlow;
 
 	private slots:
 		void preload();
@@ -59,7 +62,6 @@ private:
 signals:
 			void goToPage(unsigned int page);
 
-
 };
 //-----------------------------------------------------------------------------
 //SlideInitializer
@@ -67,8 +69,9 @@ signals:
 class SlideInitializer : public QThread
 {
 public:
-	SlideInitializer(PictureFlow * flow,int slides);
+	SlideInitializer(QMutex * m,PictureFlow * flow,int slides);
 private:
+	QMutex * mutex;
 	PictureFlow * _flow;
 	int _slides;
 	void run();
@@ -80,7 +83,7 @@ private:
 class PageLoader : public QThread
 {
 public:
-	PageLoader();
+	PageLoader(QMutex * m);
 	~PageLoader();
 	// returns FALSE if worker is still busy and can't take the task
 	bool busy() const;
@@ -91,6 +94,7 @@ public:
 protected:
 	void run();
 private:
+	QMutex * mutex;
 	QWaitCondition condition;
 
 	bool restart;
diff --git a/YACReader/goto_flow_gl.cpp b/YACReader/goto_flow_gl.cpp
index 3d1652bd..fd587032 100644
--- a/YACReader/goto_flow_gl.cpp
+++ b/YACReader/goto_flow_gl.cpp
@@ -41,6 +41,11 @@ GoToFlowGL::GoToFlowGL(QWidget* parent, FlowType flowType)
 	this->setCursor(QCursor(Qt::ArrowCursor));
 }
 
+GoToFlowGL::~GoToFlowGL()
+{
+	delete flow;
+}
+
 bool GoToFlowGL::eventFilter(QObject *target, QEvent *event)
 {
 	if (event->type() == QEvent::KeyPress) 
diff --git a/YACReader/goto_flow_gl.h b/YACReader/goto_flow_gl.h
index 9318e525..1e51cf1c 100644
--- a/YACReader/goto_flow_gl.h
+++ b/YACReader/goto_flow_gl.h
@@ -16,6 +16,7 @@ class GoToFlowGL : public GoToFlowWidget
 	Q_OBJECT
 public:
 	GoToFlowGL(QWidget* parent = 0,FlowType flowType = CoverFlowLike);
+	~GoToFlowGL();
 	void reset();
 	void centerSlide(int slide);
 	void setFlowType(FlowType flowType);
diff --git a/YACReader/goto_flow_widget.cpp b/YACReader/goto_flow_widget.cpp
index 837a9cfa..69909e5d 100644
--- a/YACReader/goto_flow_widget.cpp
+++ b/YACReader/goto_flow_widget.cpp
@@ -28,6 +28,12 @@ GoToFlowWidget::GoToFlowWidget(QWidget * parent)
 	setLayout(mainLayout);
 }
 
+GoToFlowWidget::~GoToFlowWidget() { 
+	delete topBar;
+	delete toolBar;
+	delete mainLayout;
+}
+
 void GoToFlowWidget::setPageNumber(int page)
 {
 	toolBar->setPage(page);
diff --git a/YACReader/goto_flow_widget.h b/YACReader/goto_flow_widget.h
index ce26fbb4..68972144 100644
--- a/YACReader/goto_flow_widget.h
+++ b/YACReader/goto_flow_widget.h
@@ -19,6 +19,7 @@ protected:
 	GoToFlowToolBar * toolBar;
 public:
 	GoToFlowWidget(QWidget * paret = 0);
+	virtual ~GoToFlowWidget() = 0;
 public slots:
 	virtual void reset() = 0;
 	virtual void centerSlide(int slide) = 0;
diff --git a/YACReader/main_window_viewer.cpp b/YACReader/main_window_viewer.cpp
index 540ff1c5..74b633d7 100644
--- a/YACReader/main_window_viewer.cpp
+++ b/YACReader/main_window_viewer.cpp
@@ -60,6 +60,40 @@ MainWindowViewer::MainWindowViewer()
 	setupUI();
 }
 
+MainWindowViewer::~MainWindowViewer()
+{
+	delete settings;
+	delete viewer;
+	delete had;
+
+	delete sliderAction;
+	delete openAction;
+	delete openFolderAction;
+	delete saveImageAction;
+	delete openPreviousComicAction; 
+	delete openNextComicAction;
+	delete prevAction;
+	delete nextAction;
+	delete adjustHeight;
+	delete adjustWidth;
+	delete leftRotationAction;
+	delete rightRotationAction;
+	delete doublePageAction;
+	delete goToPage;
+	delete optionsAction;
+	delete helpAboutAction;
+	delete showMagnifyingGlass;
+	delete setBookmark;
+	delete showBookmarks;
+	delete showShorcutsAction;
+	delete showInfo;
+	delete closeAction;
+	delete showDictionaryAction;
+	delete alwaysOnTopAction;
+	delete adjustToFullSizeAction;
+	delete showFlowAction;
+
+}
 void MainWindowViewer::loadConfiguration()
 {
 	settings = new QSettings(QCoreApplication::applicationDirPath()+"/YACReader.ini",QSettings::IniFormat);
@@ -823,7 +857,7 @@ void MainWindowViewer::closeEvent ( QCloseEvent * event )
 		conf.setSize(size());
 	}
 	conf.setMaximized(isMaximized());
-
+	
 	emit (closed());
 }
 
diff --git a/YACReader/main_window_viewer.h b/YACReader/main_window_viewer.h
index 5c790d8c..2f8413b3 100644
--- a/YACReader/main_window_viewer.h
+++ b/YACReader/main_window_viewer.h
@@ -127,6 +127,7 @@ signals:
 		virtual void closeEvent ( QCloseEvent * event );
 	public:
 		MainWindowViewer();
+		~MainWindowViewer();
 
 	};
 #endif
diff --git a/YACReader/render.cpp b/YACReader/render.cpp
index b728f537..d1fce827 100644
--- a/YACReader/render.cpp
+++ b/YACReader/render.cpp
@@ -130,7 +130,7 @@ QImage changeGamma( const QImage& image, int gamma )
     return changeImage< changeGamma >( image, gamma );
     }
 
-QMutex mutex;
+
 
 //-----------------------------------------------------------------------------
 // MeanNoiseReductionFilter
@@ -336,8 +336,9 @@ PageRender::PageRender()
 {
 
 }
-PageRender::PageRender(int np, const QByteArray & rd, QImage * p,unsigned int d, QVector<ImageFilter *> f)
+PageRender::PageRender(Render * r,int np, const QByteArray & rd, QImage * p,unsigned int d, QVector<ImageFilter *> f)
 :QThread(),
+render(r),
 numPage(np),
 data(rd),
 page(p),
@@ -348,7 +349,7 @@ filters(f)
 
 void PageRender::run()
 {
-	QMutexLocker locker(&mutex);
+	QMutexLocker locker(&(render->mutex));
 	
 	QImage img;
 	img.loadFromData(data);
@@ -373,8 +374,9 @@ void PageRender::run()
 // DoublePageRender
 //-----------------------------------------------------------------------------
 
-DoublePageRender::DoublePageRender(int np, const QByteArray & rd, const QByteArray & rd2, QImage * p,unsigned int d, QVector<ImageFilter *> f)
+DoublePageRender::DoublePageRender(Render * r, int np, const QByteArray & rd, const QByteArray & rd2, QImage * p,unsigned int d, QVector<ImageFilter *> f)
 :PageRender(),
+render(r),
 numPage(np),
 data(rd),
 data2(rd2),
@@ -388,7 +390,7 @@ filters(f)
 void DoublePageRender::run()
 {
 	//QImage result;
-	QMutexLocker locker(&mutex);
+	QMutexLocker locker(&(render->mutex));
 	QImage img, img2;
 	if(!data.isEmpty())
 		img.loadFromData(data);
@@ -470,6 +472,24 @@ Render::Render()
 	filters.push_back(new GammaFilter());
 }
 
+Render::~Render()
+{
+	if(comic!=0)
+	{
+		comic->moveToThread(QApplication::instance()->thread());
+		comic->deleteLater();
+	}
+
+	foreach(ImageFilter * filter, filters)
+		delete filter;
+
+	foreach(PageRender * pr,pageRenders)
+		if(pr !=0)
+		{
+			if(pr->wait())
+				delete pr;
+		}
+}
 //Este método se encarga de forzar el renderizado de las páginas.
 //Actualiza el buffer según es necesario.
 //si la pagina actual no está renderizada, se lanza un hilo que la renderize (double or single page mode) y se emite una señal que indica que se está renderizando.
@@ -484,16 +504,16 @@ void Render::render()
 			{
 				if(pagesReady[currentIndex] && pagesReady[qMin(currentIndex+1,(int)comic->numPages()-1)])
 					if(currentIndex+1 > comic->numPages()-1)
-						pageRenders[currentPageBufferedIndex] = new DoublePageRender(currentIndex,comic->getRawData()->at(currentIndex),QByteArray(),buffer[currentPageBufferedIndex],imageRotation,filters);
+						pageRenders[currentPageBufferedIndex] = new DoublePageRender(this,currentIndex,comic->getRawData()->at(currentIndex),QByteArray(),buffer[currentPageBufferedIndex],imageRotation,filters);
 					else
-						pageRenders[currentPageBufferedIndex] = new DoublePageRender(currentIndex,comic->getRawData()->at(currentIndex),comic->getRawData()->at(currentIndex+1),buffer[currentPageBufferedIndex],imageRotation,filters);
+						pageRenders[currentPageBufferedIndex] = new DoublePageRender(this,currentIndex,comic->getRawData()->at(currentIndex),comic->getRawData()->at(currentIndex+1),buffer[currentPageBufferedIndex],imageRotation,filters);
 				else
 					//las páginas no están listas, y se están cargando en el cómic
 					emit processingPage(); //para evitar confusiones esta señal debería llamarse de otra forma
 			}
 			else
 				if(pagesReady[currentIndex])
-					pageRenders[currentPageBufferedIndex] = new PageRender(currentIndex,comic->getRawData()->at(currentIndex),buffer[currentPageBufferedIndex],imageRotation,filters);
+					pageRenders[currentPageBufferedIndex] = new PageRender(this,currentIndex,comic->getRawData()->at(currentIndex),buffer[currentPageBufferedIndex],imageRotation,filters);
 				else
 					//las páginas no están listas, y se están cargando en el cómic
 					emit processingPage(); //para evitar confusiones esta señal debería llamarse de otra forma
@@ -862,7 +882,7 @@ void Render::fillBuffer()
 			pageRenders[currentPageBufferedIndex+i]==0 &&
 			pagesReady[currentIndex+1]) //preload next pages
 		{
-			pageRenders[currentPageBufferedIndex+i] = new PageRender(currentIndex+i,comic->getRawData()->at(currentIndex+i),buffer[currentPageBufferedIndex+i],imageRotation,filters);
+			pageRenders[currentPageBufferedIndex+i] = new PageRender(this,currentIndex+i,comic->getRawData()->at(currentIndex+i),buffer[currentPageBufferedIndex+i],imageRotation,filters);
 			connect(pageRenders[currentPageBufferedIndex],SIGNAL(pageReady(int)),this,SLOT(prepareAvailablePage(int)));
 			pageRenders[currentPageBufferedIndex+i]->start();
 		}
@@ -873,7 +893,7 @@ void Render::fillBuffer()
 			pageRenders[currentPageBufferedIndex-i]==0 &&
 			pagesReady[currentIndex-1]) //preload previous pages
 		{
-			pageRenders[currentPageBufferedIndex-i] = new PageRender(currentIndex-i,comic->getRawData()->at(currentIndex-i),buffer[currentPageBufferedIndex-i],imageRotation,filters);
+			pageRenders[currentPageBufferedIndex-i] = new PageRender(this,currentIndex-i,comic->getRawData()->at(currentIndex-i),buffer[currentPageBufferedIndex-i],imageRotation,filters);
 			connect(pageRenders[currentPageBufferedIndex],SIGNAL(pageReady(int)),this,SLOT(prepareAvailablePage(int)));
 			pageRenders[currentPageBufferedIndex-i]->start();
 		}
@@ -891,9 +911,9 @@ void Render::fillBufferDoublePage()
 			(pagesReady[currentIndex+2*i] && pagesReady[qMin(currentIndex+(2*i)+1,(int)comic->numPages()-1)])) //preload next pages
 		{
 			if(currentIndex+(2*i)+1 > comic->numPages()-1)
-				pageRenders[currentPageBufferedIndex+i] = new DoublePageRender(currentIndex+2*i,comic->getRawData()->at(currentIndex+(2*i)),QByteArray(),buffer[currentPageBufferedIndex+i],imageRotation,filters);
+				pageRenders[currentPageBufferedIndex+i] = new DoublePageRender(this,currentIndex+2*i,comic->getRawData()->at(currentIndex+(2*i)),QByteArray(),buffer[currentPageBufferedIndex+i],imageRotation,filters);
 			else
-				pageRenders[currentPageBufferedIndex+i] = new DoublePageRender(currentIndex+2*i,comic->getRawData()->at(currentIndex+(2*i)),comic->getRawData()->at(currentIndex+(2*i)+1),buffer[currentPageBufferedIndex+i],imageRotation,filters);
+				pageRenders[currentPageBufferedIndex+i] = new DoublePageRender(this,currentIndex+2*i,comic->getRawData()->at(currentIndex+(2*i)),comic->getRawData()->at(currentIndex+(2*i)+1),buffer[currentPageBufferedIndex+i],imageRotation,filters);
 			connect(pageRenders[currentPageBufferedIndex],SIGNAL(pageReady(int)),this,SLOT(prepareAvailablePage(int)));
 			pageRenders[currentPageBufferedIndex+i]->start();
 		}
@@ -905,9 +925,9 @@ void Render::fillBufferDoublePage()
 			(pagesReady[qMax(currentIndex-2*i,0)] && pagesReady[qMin(currentIndex-(2*i)+1,(int)comic->numPages()-1)])) //preload previous pages
 		{
 			if(currentIndex-2*i == -1)
-				pageRenders[currentPageBufferedIndex-i] = new DoublePageRender(0,QByteArray(),comic->getRawData()->at(0),buffer[currentPageBufferedIndex-i],imageRotation,filters);
+				pageRenders[currentPageBufferedIndex-i] = new DoublePageRender(this,0,QByteArray(),comic->getRawData()->at(0),buffer[currentPageBufferedIndex-i],imageRotation,filters);
 			else
-				pageRenders[currentPageBufferedIndex-i] = new DoublePageRender(currentIndex-2*i,comic->getRawData()->at(currentIndex-(2*i)),comic->getRawData()->at(currentIndex-(2*i)+1),buffer[currentPageBufferedIndex-i],imageRotation,filters);
+				pageRenders[currentPageBufferedIndex-i] = new DoublePageRender(this,currentIndex-2*i,comic->getRawData()->at(currentIndex-(2*i)),comic->getRawData()->at(currentIndex-(2*i)+1),buffer[currentPageBufferedIndex-i],imageRotation,filters);
 			connect(pageRenders[currentPageBufferedIndex],SIGNAL(pageReady(int)),this,SLOT(prepareAvailablePage(int)));
 			pageRenders[currentPageBufferedIndex-i]->start();
 		}
diff --git a/YACReader/render.h b/YACReader/render.h
index c2ade034..eb22efd3 100644
--- a/YACReader/render.h
+++ b/YACReader/render.h
@@ -15,6 +15,7 @@
 #include <QThread>
 
 class Comic;
+class Render;
 
 class ImageFilter {
 public:
@@ -73,7 +74,7 @@ class PageRender : public QThread
 	Q_OBJECT
 public:
 	PageRender();
-        PageRender(int numPage, const QByteArray & rawData, QImage * page,unsigned int degrees=0, QVector<ImageFilter *> filters = QVector<ImageFilter *>());
+        PageRender(Render * render,int numPage, const QByteArray & rawData, QImage * page,unsigned int degrees=0, QVector<ImageFilter *> filters = QVector<ImageFilter *>());
 	int getNumPage(){return numPage;};
 	void setData(const QByteArray & rawData){data = rawData;};
         void setPage(QImage * p){page = p;};
@@ -86,6 +87,7 @@ private:
 	unsigned int degrees;
 	QVector<ImageFilter *> filters;
 	void run();
+	Render * render;
 signals:
 	void pageReady(int);
 
@@ -98,7 +100,7 @@ class DoublePageRender : public PageRender
 {
 	Q_OBJECT
 public:
-        DoublePageRender(int firstPage, const QByteArray & firstPageData,const QByteArray & secondPageData, QImage * page,unsigned int degrees=0, QVector<ImageFilter *> filters = QVector<ImageFilter *>());
+        DoublePageRender(Render * render, int firstPage, const QByteArray & firstPageData,const QByteArray & secondPageData, QImage * page,unsigned int degrees=0, QVector<ImageFilter *> filters = QVector<ImageFilter *>());
 private:
 	int numPage;
 	QByteArray data;
@@ -107,6 +109,7 @@ private:
 	unsigned int degrees;
 	QVector<ImageFilter *> filters;
 	void run();
+	Render * render;
 signals:
 	void pageReady(int);
 
@@ -117,6 +120,7 @@ class Render : public QObject {
 Q_OBJECT
 public:
 	Render();
+	~Render();
 
 public slots:
 	void render();
@@ -187,6 +191,10 @@ private:
 	QVector<bool> pagesReady;
 	int imageRotation;
 	QVector<ImageFilter *> filters;
+	QMutex mutex;
+
+	friend class PageRender;
+	friend class DoublePageRender;
 
 };
 
diff --git a/YACReader/viewer.cpp b/YACReader/viewer.cpp
index d304332b..c1539058 100644
--- a/YACReader/viewer.cpp
+++ b/YACReader/viewer.cpp
@@ -115,6 +115,23 @@ drag(false)
 
 }
 
+Viewer::~Viewer()
+{
+	delete render;
+	delete goToFlow;
+	delete translator;
+	delete translatorAnimation;
+	delete content;
+	delete hideCursorTimer;
+	delete informationLabel;
+	delete verticalScroller;
+	delete bd;
+	delete notificationsLabel;
+	delete mglass;
+	if(currentPage != 0)
+		delete currentPage;
+}
+
 void Viewer::createConnections()
 {
 	//magnifyingGlass (update mg after a background change
diff --git a/YACReader/viewer.h b/YACReader/viewer.h
index 6b46b72e..07593ede 100644
--- a/YACReader/viewer.h
+++ b/YACReader/viewer.h
@@ -132,6 +132,7 @@ virtual void mouseReleaseEvent ( QMouseEvent * event );
 
 	public:
 		Viewer(QWidget * parent = 0);
+		~Viewer();
 		void toggleFullScreen();
 		const QPixmap * pixmap();
 		//Comic * getComic(){return comic;}
diff --git a/common/yacreader_flow_gl.cpp b/common/yacreader_flow_gl.cpp
index 2eb6644b..16e2d4b1 100644
--- a/common/yacreader_flow_gl.cpp
+++ b/common/yacreader_flow_gl.cpp
@@ -1131,6 +1131,14 @@ YACReaderPageFlowGL::YACReaderPageFlowGL(QWidget *parent,struct Preset p )
 	worker->flow = this;
 }
 
+YACReaderPageFlowGL::~YACReaderPageFlowGL()
+{
+	this->killTimer(timerId);
+	//worker->deleteLater();
+	rawImages.clear();
+	free(cfImages);
+}
+
 //////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////
diff --git a/common/yacreader_flow_gl.h b/common/yacreader_flow_gl.h
index 9fea2654..323db5a5 100644
--- a/common/yacreader_flow_gl.h
+++ b/common/yacreader_flow_gl.h
@@ -170,7 +170,7 @@ public:
 
 	/*Constructor*/
 	YACReaderFlowGL(QWidget *parent = 0,struct Preset p = pressetYACReaderFlowDownConfig);
-    ~YACReaderFlowGL();
+    virtual ~YACReaderFlowGL();
 
 	//size;
     QSize minimumSizeHint() const;
@@ -301,6 +301,7 @@ class YACReaderPageFlowGL : public YACReaderFlowGL
 {
 public:
 	YACReaderPageFlowGL(QWidget *parent = 0,struct Preset p = defaultYACReaderFlowConfig);
+	~YACReaderPageFlowGL();
 	void updateImageData();
 	void populate(int n);
 	QVector<bool> imagesReady;
diff --git a/custom_widgets/help_about_dialog.cpp b/custom_widgets/help_about_dialog.cpp
index 2c7b97b9..ff926a6b 100644
--- a/custom_widgets/help_about_dialog.cpp
+++ b/custom_widgets/help_about_dialog.cpp
@@ -34,6 +34,13 @@ HelpAboutDialog::HelpAboutDialog(QWidget * parent)
 	resize(500, QApplication::desktop()->availableGeometry().height()*0.83);
 }
 
+HelpAboutDialog::~HelpAboutDialog()
+{
+	delete aboutText;
+	delete helpText;
+	delete tabWidget;
+}
+
 HelpAboutDialog::HelpAboutDialog(const QString & pathAbout,const QString & pathHelp,QWidget * parent)
 :QDialog(parent)
 {
diff --git a/custom_widgets/help_about_dialog.h b/custom_widgets/help_about_dialog.h
index 14eb0f7b..9a90f98f 100644
--- a/custom_widgets/help_about_dialog.h
+++ b/custom_widgets/help_about_dialog.h
@@ -12,6 +12,7 @@ Q_OBJECT
 public:
 	HelpAboutDialog(QWidget * parent=0);
 	HelpAboutDialog(const QString & pathAbout,const QString & pathHelp,QWidget * parent =0);
+	~HelpAboutDialog();
 public slots:
 	void loadAboutInformation(const QString & path);
 	void loadHelp(const QString & path);