diff --git a/lib/classes/task/period/apibridge.class.php b/lib/classes/task/period/apibridge.class.php
index 611a081e32..10517c335e 100644
--- a/lib/classes/task/period/apibridge.class.php
+++ b/lib/classes/task/period/apibridge.class.php
@@ -177,7 +177,7 @@ class task_period_apibridge extends task_appboxAbstract
             , 'sbas_id' => $element->get_record()->get_sbas_id()
             , 'record_id' => $element->get_record()->get_record_id()
         );
-        $events_mngr = eventsmanager_broker::getInstance(appbox::get_instance(), $Core);
+        $events_mngr = eventsmanager_broker::getInstance(appbox::get_instance(\bootstrap::getCore()), $Core);
         $events_mngr->trigger('__BRIDGE_UPLOAD_FAIL__', $params);
 
         break;
diff --git a/lib/classes/task/period/archive.class.php b/lib/classes/task/period/archive.class.php
index 0f7f8438f0..694eb7a0da 100644
--- a/lib/classes/task/period/archive.class.php
+++ b/lib/classes/task/period/archive.class.php
@@ -226,7 +226,7 @@ class task_period_archive extends task_abstract
    */
   public function printInterfaceHTML()
   {
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
 
     ob_start();
     ?>
diff --git a/lib/classes/task/period/batchupload.class.php b/lib/classes/task/period/batchupload.class.php
index 1086a14e6e..7b788a2427 100644
--- a/lib/classes/task/period/batchupload.class.php
+++ b/lib/classes/task/period/batchupload.class.php
@@ -54,7 +54,7 @@ class task_period_batchupload extends task_appboxAbstract
 
   protected function process_one_content(appbox $appbox, Array $row)
   {
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $registry = $appbox->get_registry();
     $conn = $appbox->get_connection();
     $session = $appbox->get_session();
diff --git a/lib/classes/task/period/outofdate.class.php b/lib/classes/task/period/outofdate.class.php
index 765cbfdcf8..37b8bf8a93 100644
--- a/lib/classes/task/period/outofdate.class.php
+++ b/lib/classes/task/period/outofdate.class.php
@@ -400,7 +400,7 @@ class task_period_outofdate extends task_abstract
   {
     global $usr_id;
 
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $session = $appbox->get_session();
     $user = User_Adapter::getInstance($session->get_usr_id(), $appbox);
     ob_start();
diff --git a/lib/classes/task/period/upgradetov31.class.php b/lib/classes/task/period/upgradetov31.class.php
index 9b66a7cb39..9734f1b4b5 100644
--- a/lib/classes/task/period/upgradetov31.class.php
+++ b/lib/classes/task/period/upgradetov31.class.php
@@ -43,7 +43,7 @@ class task_period_upgradetov31 extends task_abstract
   {
     printf("taskid %s starting." . PHP_EOL, $this->get_task_id());
     // task can't be stopped here
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $conn = $appbox->get_connection();
     $registry = $appbox->get_registry();
     $running = true;
@@ -58,7 +58,7 @@ class task_period_upgradetov31 extends task_abstract
     $todo = $this->how_many_left();
     $done = 0;
 
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $ret = 'stopped';
 
     $this->setProgress($done, $todo);
@@ -156,7 +156,7 @@ class task_period_upgradetov31 extends task_abstract
   private function how_many_left()
   {
     $todo = 0;
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
 
     foreach ($appbox->get_databoxes() as $databox)
     {
diff --git a/lib/classes/task/period/upgradetov32.class.php b/lib/classes/task/period/upgradetov32.class.php
index 93452561f6..337d39ad25 100644
--- a/lib/classes/task/period/upgradetov32.class.php
+++ b/lib/classes/task/period/upgradetov32.class.php
@@ -61,7 +61,7 @@ class task_period_upgradetov32 extends task_abstract
     printf("taskid %s starting." . PHP_EOL, $this->get_task_id());
 
     $registry = registry::get_instance();
-    $registry->set('GV_cache_server_type', 'nocache', \registry::TYPE_STRING);
+//    $registry->set('GV_cache_server_type', 'nocache', \registry::TYPE_STRING);
     $registry->set('GV_sphinx', false, \registry::TYPE_BOOLEAN);
 
     if (!$this->sbas_id)
diff --git a/lib/classes/task/period/workflow01.class.php b/lib/classes/task/period/workflow01.class.php
index 94a550b673..a48d8083de 100644
--- a/lib/classes/task/period/workflow01.class.php
+++ b/lib/classes/task/period/workflow01.class.php
@@ -308,7 +308,7 @@ class task_period_workflow01 extends task_databoxAbstract
 
   public function printInterfaceHTML()
   {
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $session = $appbox->get_session();
     $user = User_Adapter::getInstance($session->get_usr_id(), $appbox);
     ob_start();
@@ -475,7 +475,7 @@ class task_period_workflow01 extends task_databoxAbstract
   {
     $request = http_request::getInstance();
 
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $session = $appbox->get_session();
     $user = User_Adapter::getInstance($session->get_usr_id(), $appbox);
 
diff --git a/lib/classes/task/period/writemeta.class.php b/lib/classes/task/period/writemeta.class.php
index 716828b287..2ebbec7d8c 100644
--- a/lib/classes/task/period/writemeta.class.php
+++ b/lib/classes/task/period/writemeta.class.php
@@ -183,7 +183,7 @@ class task_period_writemeta extends task_databoxAbstract
 
   public function printInterfaceHTML()
   {
-    $appbox = appbox::get_instance();
+    $appbox = appbox::get_instance(\bootstrap::getCore());
     $session = $appbox->get_session();
     $sbas_ids = User_Adapter::getInstance($session->get_usr_id(), $appbox)
                     ->ACL()->get_granted_sbas(array('bas_manage'));