diff --git a/YACReaderLibrary/create_library_dialog.cpp b/YACReaderLibrary/create_library_dialog.cpp
index 25fae77d..4a608590 100644
--- a/YACReaderLibrary/create_library_dialog.cpp
+++ b/YACReaderLibrary/create_library_dialog.cpp
@@ -128,6 +128,14 @@ void CreateLibraryDialog::close()
 	accept->setEnabled(true);
 	QDialog::close();
 }
+
+void CreateLibraryDialog::setDataAndStart(QString name, QString path)
+{
+	this->path->setText(path);
+	this->nameEdit->setText(name);
+	show();
+	create();
+}
 //-----------------------------------------------------------------------------
 // UpdateLibraryDialog
 //-----------------------------------------------------------------------------
diff --git a/YACReaderLibrary/create_library_dialog.h b/YACReaderLibrary/create_library_dialog.h
index f545d4e1..a671fcce 100644
--- a/YACReaderLibrary/create_library_dialog.h
+++ b/YACReaderLibrary/create_library_dialog.h
@@ -30,6 +30,7 @@
 		void findPath();
 		void showCurrentFile(QString file);
 		void close();
+		void setDataAndStart(QString name, QString paht);
 	signals:
 		void createLibrary(QString source, QString target, QString name);
 		void cancelCreate();
diff --git a/YACReaderLibrary/db/data_base_management.cpp b/YACReaderLibrary/db/data_base_management.cpp
index b8e31492..8d9d1aa2 100644
--- a/YACReaderLibrary/db/data_base_management.cpp
+++ b/YACReaderLibrary/db/data_base_management.cpp
@@ -494,14 +494,24 @@ QString DataBaseManagement::checkValidDB(const QString & fullPath)
 		version.exec();
 		if(version.next())
 		{
+			db.close();
+			QSqlDatabase::removeDatabase(fullPath);
 			return version.record().value("version").toString();
 		}
 		else
+		{
+			db.close();
+			QSqlDatabase::removeDatabase(fullPath);
 			return "";
+		}
 
 	}
 	else
-	return "";
+	{
+		db.close();
+		QSqlDatabase::removeDatabase(fullPath);
+		return "";
+	}
 }
 
 int DataBaseManagement::compareVersions(const QString & v1, const QString v2)
diff --git a/YACReaderLibrary/library_creator.cpp b/YACReaderLibrary/library_creator.cpp
index aaed401d..8a4e1d88 100644
--- a/YACReaderLibrary/library_creator.cpp
+++ b/YACReaderLibrary/library_creator.cpp
@@ -41,8 +41,13 @@ void LibraryCreator::processLibrary(const QString & source, const QString & targ
 {
 	_source = source;
 	_target = target;
-	if(!(QFile(target+"/library.ydb").exists())) //TODO, no sirve sólo con realizar el update, hay que validar la base de datos y determinar si existe "/covers"
+	//if(!(QFile(target+"/library.ydb").exists())) //TODO, no sirve sólo con realizar el update, hay que validar la base de datos y determinar si existe "/covers"
+	if(DataBaseManagement::checkValidDB(target+"/library.ydb")=="")
+	{
+		//se limpia el directorio ./yacreaderlibrary
+		delTree(target);
 		_mode = CREATOR;
+	}
 	else
 		_mode = UPDATER;
 }
diff --git a/YACReaderLibrary/library_window.cpp b/YACReaderLibrary/library_window.cpp
index 3be7c61b..aa1e1991 100644
--- a/YACReaderLibrary/library_window.cpp
+++ b/YACReaderLibrary/library_window.cpp
@@ -600,43 +600,43 @@ void LibraryWindow::createConnections()
 
 void LibraryWindow::loadLibrary(const QString & name)
 {
-	if(libraries.size()>0)
+	if(libraries.size()>0)  //si hay bibliotecas...
 	{	
 		QString path=libraries.value(name)+"/.yacreaderlibrary";
 		QDir d; //TODO change this by static methods (utils class?? with delTree for example)
 		QString dbVersion;
-		if(d.exists(path) && (dbVersion = DataBaseManagement::checkValidDB(path+"/library.ydb")) != "")
+		if(d.exists(path) && (dbVersion = DataBaseManagement::checkValidDB(path+"/library.ydb")) != "") //si existe en disco la biblioteca seleccionada, y es válida..
 		{
 			int comparation;
-			if((comparation = DataBaseManagement::compareVersions(dbVersion,VERSION)) == 0)
+			if((comparation = DataBaseManagement::compareVersions(dbVersion,VERSION)) == 0) //en caso de que la versión se igual que la actual
 			{
-			index = 0;
-			sm->clear();
-			//foldersView->setModel(NULL); //TODO comprobar pq no sirve con usar simplemente las señales beforeReset y reset
-			//comicView->setModel(NULL);
+				index = 0;
+				sm->clear();
+				//foldersView->setModel(NULL); //TODO comprobar pq no sirve con usar simplemente las señales beforeReset y reset
+				//comicView->setModel(NULL);
 
-			dm->setupModelData(path);
-			foldersView->setModel(dm);
-			
-			d.setCurrent(libraries.value(name));
-			d.setFilter(QDir::AllDirs | QDir::Files | QDir::Hidden | QDir::NoSymLinks | QDir::NoDotAndDotDot);
-			if(d.count()<=1) //librería de sólo lectura
-			{
-				//QMessageBox::critical(NULL,QString::number(d.count()),QString::number(d.count()));
-				disableActions();
-				importedCovers = true;
-			}
-			else //librería normal abierta
-			{
-				enableActions();
-				importedCovers = false;
-			}
-			enableLibraryActions();
+				dm->setupModelData(path);
+				foldersView->setModel(dm);
 
-			loadCovers(QModelIndex());
+				d.setCurrent(libraries.value(name));
+				d.setFilter(QDir::AllDirs | QDir::Files | QDir::Hidden | QDir::NoSymLinks | QDir::NoDotAndDotDot);
+				if(d.count()<=1) //librería de sólo lectura
+				{
+					//QMessageBox::critical(NULL,QString::number(d.count()),QString::number(d.count()));
+					disableActions();
+					importedCovers = true;
+				}
+				else //librería normal abierta
+				{
+					enableActions();
+					importedCovers = false;
+				}
+				enableLibraryActions();
 
-			//includeComicsCheckBox->setCheckState(Qt::Unchecked);
-			foldersFilter->clear();
+				loadCovers(QModelIndex());
+
+				//includeComicsCheckBox->setCheckState(Qt::Unchecked);
+				foldersFilter->clear();
 			}
 			else
 			{
@@ -675,14 +675,31 @@ void LibraryWindow::loadLibrary(const QString & name)
 			comicFlow->clear();
 			disableAllActions();//TODO comprobar que se deben deshabilitar
 
-			QString currentLibrary = selectedLibrary->currentText();
-			if(QMessageBox::question(this,tr("Library not available"),tr("Library ")+currentLibrary+tr(" is no longer available. Do you want to remove it?"),QMessageBox::Yes,QMessageBox::No)==QMessageBox::Yes)
+			//si la librería no existe en disco, se ofrece al usuario la posibiliad de eliminarla
+			if(!d.exists(path))
 			{
-				deleteCurrentLibrary();
+				QString currentLibrary = selectedLibrary->currentText();
+				if(QMessageBox::question(this,tr("Library not available"),tr("Library ")+currentLibrary+tr(" is no longer available. Do you want to remove it?"),QMessageBox::Yes,QMessageBox::No)==QMessageBox::Yes)
+				{
+					deleteCurrentLibrary();
+				}
+			}
+			else//si existe el path, puede ser que la librería sea alguna versión pre-5.0 ó que esté corrupta
+			{
+				QString currentLibrary = selectedLibrary->currentText();
+				QString path = libraries.value(selectedLibrary->currentText());
+				if(QMessageBox::question(this,tr("Old library or corrupted"),tr("Library ")+currentLibrary+tr(" is corrupted or has been created with an older version of YACReaderLibrary. It must be created again. Do you want to create the library now?"),QMessageBox::Yes,QMessageBox::No)==QMessageBox::Yes)
+				{
+					QDir d(path+"/.yacreaderlibrary");
+					delTree(d);
+					d.rmdir(path+"/.yacreaderlibrary");
+					createLibraryDialog->setDataAndStart(currentLibrary,path);
+					//create(path,path+"/.yacreaderlibrary",currentLibrary);
+				}
 			}
 		}
 	}
-	else
+	else //en caso de que no exista ninguna biblioteca se desactivan los botones pertinentes
 	{
 		disableAllActions();
 	}