diff --git a/src/adaptors/UBImportImage.cpp b/src/adaptors/UBImportImage.cpp
index c85ba342..64a42fc1 100644
--- a/src/adaptors/UBImportImage.cpp
+++ b/src/adaptors/UBImportImage.cpp
@@ -74,24 +74,6 @@ QString UBImportImage::importFileFilter()
     return filter;
 }
 
-/*
-bool UBImportImage::addFileToDocument(UBDocumentProxy* pDocument, const QFile& pFile)
-{
-    int res = UBDocumentManager::documentManager()->addImageAsPageToDocument(QStringList(QFileInfo(pFile).absoluteFilePath()), pDocument);
-    if (res == 0)
-    {
-        UBApplication::showMessage(tr("Image import failed."));
-        return false;
-    }
-    else
-    {
-        UBApplication::showMessage(tr("Image import successful."));
-        return true;
-    }
-}
-*/
-
-
 QList<UBGraphicsItem*> UBImportImage::import(const QUuid& uuid, const QString& filePath)
 {
     QList<UBGraphicsItem*> result;
diff --git a/src/adaptors/UBImportPDF.cpp b/src/adaptors/UBImportPDF.cpp
index a1971118..fd9dc16b 100644
--- a/src/adaptors/UBImportPDF.cpp
+++ b/src/adaptors/UBImportPDF.cpp
@@ -91,66 +91,3 @@ const QString& UBImportPDF::folderToCopy()
 {
     return UBPersistenceManager::objectDirectory;
 }
-
-/*
-bool UBImportPDF::addFileToDocument(UBDocumentProxy* pDocument, const QFile& pFile)
-{
-    QString documentName = QFileInfo(pFile.fileName()).completeBaseName();
-
-    QUuid uuid = QUuid::createUuid();
-
-    QString filepath = UBPersistenceManager::persistenceManager()->addPdfFileToDocument(pDocument, pFile.fileName(), uuid);
-
-    PDFRenderer *pdfRenderer = PDFRenderer::rendererForUuid(uuid, pDocument->persistencePath() + "/" + filepath, true); // renderer is automatically deleted when not used anymore
-
-    if (!pdfRenderer->isValid())
-    {
-        UBApplication::showMessage(tr("PDF import failed."));
-        return false;
-    }
-	pdfRenderer->setDPI(this->dpi);
-
-    int documentPageCount = pDocument->pageCount();
-
-    if (documentPageCount == 1 && UBPersistenceManager::persistenceManager()->loadDocumentScene(pDocument, 0)->isEmpty())
-    {
-        documentPageCount = 0;
-    }
-
-    int pdfPageCount = pdfRenderer->pageCount();
-
-    for(int pdfPageNumber = 1; pdfPageNumber <= pdfPageCount; pdfPageNumber++)
-    {
-        int pageIndex = documentPageCount + pdfPageNumber;
-        UBApplication::showMessage(tr("Importing page %1 of %2").arg(pdfPageNumber).arg(pdfPageCount), true);
-
-        UBGraphicsScene* scene = 0;
-
-        if (pageIndex == 0)
-        {
-            scene = UBPersistenceManager::persistenceManager()->loadDocumentScene(pDocument, pageIndex);
-        }
-        else
-        {
-            scene = UBPersistenceManager::persistenceManager()->createDocumentSceneAt(pDocument, pageIndex);
-        }
-
-        scene->setBackground(false, false);
-        UBGraphicsPDFItem *pdfItem = new UBGraphicsPDFItem(pdfRenderer, pdfPageNumber); // deleted by the scene
-        scene->addItem(pdfItem);
-
-        pdfItem->setPos(-pdfItem->boundingRect().width() / 2, -pdfItem->boundingRect().height() / 2);
-
-        scene->setAsBackgroundObject(pdfItem, false, false);
-
-        scene->setNominalSize(pdfItem->boundingRect().width(), pdfItem->boundingRect().height());
-
-
-        UBPersistenceManager::persistenceManager()->persistDocumentScene(pDocument, scene, pageIndex);
-    }
-
-    UBApplication::showMessage(tr("PDF import successful."));
-
-    return true;
-}
-*/
\ No newline at end of file
diff --git a/src/adaptors/UBThumbnailAdaptor.cpp b/src/adaptors/UBThumbnailAdaptor.cpp
index 057cf991..5feaccd8 100644
--- a/src/adaptors/UBThumbnailAdaptor.cpp
+++ b/src/adaptors/UBThumbnailAdaptor.cpp
@@ -117,9 +117,6 @@ void UBThumbnailAdaptor::load(UBDocumentProxy* proxy, QList<const QPixmap*>& lis
 
 void UBThumbnailAdaptor::persistScene(UBDocumentProxy* proxy, UBGraphicsScene* pScene, int pageIndex, bool overrideModified)
 {
-
-    qDebug() << "Persist scene on path " << proxy->persistencePath() << ", index " << pageIndex;
-
     QString fileName = proxy->persistencePath() + UBFileSystemUtils::digitFileFormat("/page%1.thumbnail.jpg", pageIndex);
 
     QFile thumbFile(fileName);
diff --git a/src/gui/UBDockPalette.cpp b/src/gui/UBDockPalette.cpp
index a302d847..38f375be 100644
--- a/src/gui/UBDockPalette.cpp
+++ b/src/gui/UBDockPalette.cpp
@@ -17,12 +17,16 @@
 #include <QPainterPath>
 
 #include "UBDockPalette.h"
-#include "core/UBSettings.h"
+
 #include "frameworks/UBPlatformUtils.h"
+
+#include "core/UBSettings.h"
 #include "core/UBApplication.h"
 #include "core/UBPreferencesController.h"
 #include "core/UBDownloadManager.h"
 
+#include "board/UBBoardController.h"
+
 #include "core/memcheck.h"
 
 /**
@@ -79,6 +83,8 @@ UBDockPalette::UBDockPalette(eUBDockPaletteType paletteType, QWidget *parent, co
 	onToolbarPosUpdated();
 	connect(UBSettings::settings()->appToolBarPositionedAtTop, SIGNAL(changed(QVariant)), this, SLOT(onToolbarPosUpdated()));
 	connect(UBDownloadManager::downloadManager(), SIGNAL(allDownloadsFinished()), this, SLOT(onAllDownloadsFinished()));
+
+	connect(UBApplication::boardController,SIGNAL(documentSet(UBDocumentProxy*)),this,SLOT(onDocumentSet(UBDocumentProxy*)));
 }
 
 /**
@@ -98,6 +104,11 @@ UBDockPalette::~UBDockPalette()
 	}
 }
 
+void UBDockPalette::onDocumentSet(UBDocumentProxy* documentProxy)
+{
+	Q_UNUSED(documentProxy);
+}
+
 /**
  * \brief Get the current orientation
  * @return the current orientation
diff --git a/src/gui/UBDockPalette.h b/src/gui/UBDockPalette.h
index f1c6f323..2dac9e08 100644
--- a/src/gui/UBDockPalette.h
+++ b/src/gui/UBDockPalette.h
@@ -15,6 +15,8 @@
 #ifndef UBDOCKPALETTE_H
 #define UBDOCKPALETTE_H
 
+class UBDocumentProxy;
+
 #include <QWidget>
 #include <QMouseEvent>
 #include <QBrush>
@@ -131,6 +133,7 @@ public slots:
     void onShowTabWidget(UBDockPaletteWidget* widget);
     void onHideTabWidget(UBDockPaletteWidget* widget);
     void onAllDownloadsFinished();
+    virtual void onDocumentSet(UBDocumentProxy* documentProxy);
 
 protected:
     virtual int border();
diff --git a/src/gui/UBLeftPalette.cpp b/src/gui/UBLeftPalette.cpp
index 7f79ff18..ffb93f90 100644
--- a/src/gui/UBLeftPalette.cpp
+++ b/src/gui/UBLeftPalette.cpp
@@ -51,6 +51,14 @@ UBLeftPalette::~UBLeftPalette()
 
 }
 
+
+void UBLeftPalette::onDocumentSet(UBDocumentProxy* documentProxy)
+{
+	//This is necessary to force the teacher guide to be showed in priority each time a document is set
+	if(documentProxy && UBSettings::settings()->teacherGuidePageZeroActivated->get().toBool())
+		mLastOpenedTabForMode.insert(eUBDockPaletteWidget_BOARD, 1);
+}
+
 /**
  * \brief Update the maximum width
  */
diff --git a/src/gui/UBLeftPalette.h b/src/gui/UBLeftPalette.h
index 43f472ab..72e4fc1a 100644
--- a/src/gui/UBLeftPalette.h
+++ b/src/gui/UBLeftPalette.h
@@ -25,6 +25,9 @@ public:
 
     bool switchMode(eUBDockPaletteWidgetMode mode);
 
+public slots:
+    void onDocumentSet(UBDocumentProxy* documentProxy);
+
 protected:
     void updateMaxWidth();
     void resizeEvent(QResizeEvent *event);
diff --git a/src/gui/UBTeacherGuideWidget.cpp b/src/gui/UBTeacherGuideWidget.cpp
index cb2b912d..ee81836e 100644
--- a/src/gui/UBTeacherGuideWidget.cpp
+++ b/src/gui/UBTeacherGuideWidget.cpp
@@ -1149,7 +1149,6 @@ void UBTeacherGuideWidget::onActiveSceneChanged()
     		mpPageZeroWidget->switchToMode(tUBTGZeroPageMode_EDITION);
 
         setCurrentWidget(mpPageZeroWidget);
-
     }
     else{
     	if(mpEditionWidget->isModified()){