diff --git a/Classes/Controller/QuizController.php b/Classes/Controller/QuizController.php
index 82fb1bb..0d161b9 100644
--- a/Classes/Controller/QuizController.php
+++ b/Classes/Controller/QuizController.php
@@ -852,14 +852,12 @@ public function doAll(\Fixpunkt\FpMasterquiz\Domain\Model\Quiz $quiz, array $use
                         );
                     } else if ($evaluation->getCe() > 0) {
                         // Content-Element ausgeben
-                        // oder so: https://www.andrerinas.de/tutorials/typo3-viewhelper-zum-rendern-von-tt-content-anhand-der-uid.html
                         $ttContentConfig = [
                             'tables' => 'tt_content',
                             'source' => $evaluation->getCe(),
                             'dontCheckPid' => 1
                         ];
-                        // TODO: funktioniert nicht mehr!
-                        $finalContent = GeneralUtility::makeInstance('TYPO3\CMS\Frontend\ContentObject\RecordsContentObject')->render($ttContentConfig);
+                        $finalContent = $GLOBALS['TSFE']->cObj->cObjGetSingle('RECORDS', $ttContentConfig);
                         $finalBodytext = $evaluation->getBodytext();
                         $finalImageuid = $evaluation->getImage();
                     } else {
@@ -1370,8 +1368,7 @@ public function introAction(): ResponseInterface
                 'tables' => 'tt_content',
                 'source' => $this->settings['introContentUid'],
                 'dontCheckPid' => 1);
-            // TODO: funktioniert nicht mehr!
-            $contentElement = GeneralUtility::makeInstance('TYPO3\CMS\Frontend\ContentObject\RecordsContentObject')->render($ttContentConfig);
+            $contentElement = $GLOBALS['TSFE']->cObj->cObjGetSingle('RECORDS', $ttContentConfig);
         } else {
             $contentElement = '';
         }
diff --git a/Classes/Task/CsvExportAdditionalFieldProvider.php b/Classes/Task/CsvExportAdditionalFieldProvider.php
index 02e30f7..7b145c3 100644
--- a/Classes/Task/CsvExportAdditionalFieldProvider.php
+++ b/Classes/Task/CsvExportAdditionalFieldProvider.php
@@ -142,8 +142,8 @@ public function validateAdditionalFields(array &$submittedData, SchedulerModuleC
                 ->where(
                     $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter((int)$submittedData['fpmasterquiz']['page'], \PDO::PARAM_INT))
                 )
-                ->execute()
-                ->fetchColumn(0);
+                ->executeQuery()
+                ->fetchOne();
             if ($count == 0) {
                 $isValid = FALSE;
                 $this->addMessage(
@@ -179,10 +179,13 @@ public function saveAdditionalFields(array $submittedData, AbstractTask $task)
     {
         /** @var $task ValidatorTask */
         $task->setCsvfile($submittedData['fpmasterquiz']['csvfile']);
-        $task->setPage($submittedData['fpmasterquiz']['page']);
+        $task->setPage(intval($submittedData['fpmasterquiz']['page']));
         $task->setSeparator($submittedData['fpmasterquiz']['separator']);
         $task->setDelimiter($submittedData['fpmasterquiz']['delimiter']);
         $task->setAnswersDelimiter($submittedData['fpmasterquiz']['ansdelimiter']);
-        $task->setConvert($submittedData['fpmasterquiz']['convert']);
+        if (isset($submittedData['fpmasterquiz']['convert']))
+            $task->setConvert(intval($submittedData['fpmasterquiz']['convert']));
+        else
+            $task->setConvert(0);
     }
 }
\ No newline at end of file
diff --git a/Classes/Task/CsvExportTask.php b/Classes/Task/CsvExportTask.php
index 5e7b8ed..d709f8e 100644
--- a/Classes/Task/CsvExportTask.php
+++ b/Classes/Task/CsvExportTask.php
@@ -214,7 +214,7 @@ public function execute() {
                 $queryBuilder->expr()->eq('tx_fpmasterquiz_domain_model_answer.pid', $queryBuilder->createNamedParameter($uid, \PDO::PARAM_INT))
             )
             ->orderBy('mm.sorting', 'ASC')
-            ->execute();
+            ->executeQuery();
         while ($row = $statement->fetch()) {
             if (isset($mmArray[$row['uid_local']])) {
                 $mmArray[$row['uid_local']] .= $answersDelimiter . $row['title'];
@@ -253,7 +253,7 @@ public function execute() {
             )
             ->orderBy('part.uid', 'DESC')
             ->addOrderBy('suid', 'ASC')
-            ->execute();
+            ->executeQuery();
         while ($row = $statement->fetch()) {
 
             if ($i > 0)
diff --git a/Classes/Task/DeleteParticipantAdditionalFieldProvider.php b/Classes/Task/DeleteParticipantAdditionalFieldProvider.php
index 4f6e081..cdf24bf 100644
--- a/Classes/Task/DeleteParticipantAdditionalFieldProvider.php
+++ b/Classes/Task/DeleteParticipantAdditionalFieldProvider.php
@@ -96,8 +96,8 @@ public function validateAdditionalFields(array &$submittedData, SchedulerModuleC
                 ->where(
                     $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter((int)$submittedData['fp_masterquiz']['page'], \PDO::PARAM_INT))
                 )
-                ->execute()
-                ->fetchColumn(0);
+                ->executeQuery()
+                ->fetchOne();
 			if ($count == 0) {
 				$isValid = FALSE;
 				$this->addMessage(
@@ -132,8 +132,11 @@ public function validateAdditionalFields(array &$submittedData, SchedulerModuleC
 	public function saveAdditionalFields(array $submittedData, AbstractTask $task)
 	{
 		/** @var $task ValidatorTask */
-		$task->setPage($submittedData['fp_masterquiz']['page']);
-		$task->setDays($submittedData['fp_masterquiz']['days']);
-		$task->setFlag($submittedData['fp_masterquiz']['flag']);
+		$task->setPage(intval($submittedData['fp_masterquiz']['page']));
+		$task->setDays(intval($submittedData['fp_masterquiz']['days']));
+        if (isset($submittedData['fp_masterquiz']['flag']))
+		    $task->setFlag(intval($submittedData['fp_masterquiz']['flag']));
+        else
+            $task->setFlag(0);
 	}
 }
\ No newline at end of file
diff --git a/Classes/Task/DeleteParticipantTask.php b/Classes/Task/DeleteParticipantTask.php
index 6414d7b..104d72c 100644
--- a/Classes/Task/DeleteParticipantTask.php
+++ b/Classes/Task/DeleteParticipantTask.php
@@ -111,7 +111,7 @@ public function execute() {
     		   	->andWhere(
     		   		$queryBuilder->expr()->lt('crdate', $queryBuilder->createNamedParameter($past, \PDO::PARAM_INT))
     	   		)
-    		   ->execute();
+    		   ->executeQuery();
     		while ($row = $statement->fetch()) {
     			$participantArray[] = $row['uid'];
     		}
@@ -124,7 +124,7 @@ public function execute() {
     				)
     				->set('deleted', '1')
     				->set('tstamp', $now)
-    				->execute();
+    				->executeStatement();
     			$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('tx_fpmasterquiz_domain_model_participant');
     			$queryBuilder
     				->update('tx_fpmasterquiz_domain_model_participant')
@@ -133,7 +133,7 @@ public function execute() {
     				)
     				->set('deleted', '1')
     				->set('tstamp', $now)
-    				->execute();
+    				->executeStatement();
     		}
 		} else {
 		    $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('tx_fpmasterquiz_domain_model_selected');
@@ -146,7 +146,7 @@ public function execute() {
 		      ->andWhere(
 		         $queryBuilder->expr()->lt('crdate', $queryBuilder->createNamedParameter($past, \PDO::PARAM_INT))
 		      )
-		      ->execute();
+		      ->executeQuery();
 		    while ($row = $statement->fetch()) {
 		        $selectedArray[] = $row['uid'];
 		    }
@@ -159,7 +159,7 @@ public function execute() {
     		      ->where(
     		          $queryBuilder->expr()->eq('uid_local', $queryBuilder->createNamedParameter($selectedUid, \PDO::PARAM_INT))
 		          )
-		          ->execute();
+		          ->executeStatement();
 		    }
 		    
 		    $table = 'tx_fpmasterquiz_domain_model_selected';
@@ -170,7 +170,7 @@ public function execute() {
 		          ->where(
 		              $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($selectedUid, \PDO::PARAM_INT))
 		          )
-		          ->execute();
+		          ->executeStatement();
 		    }
 		    
 		    $table = 'tx_fpmasterquiz_domain_model_participant';
@@ -183,7 +183,7 @@ public function execute() {
 		      ->andWhere(
 		          $queryBuilder->expr()->lt('crdate', $queryBuilder->createNamedParameter($past, \PDO::PARAM_INT))
 		      )
-		      ->execute();
+		      ->executeStatement();
 		}
 		return $successfullyExecuted;
 	}