diff --git a/InstructorsAndTrainees/instructorsandtraineeswidget.cpp b/InstructorsAndTrainees/instructorsandtraineeswidget.cpp
index b1bcc47..03b4e84 100644
--- a/InstructorsAndTrainees/instructorsandtraineeswidget.cpp
+++ b/InstructorsAndTrainees/instructorsandtraineeswidget.cpp
@@ -172,7 +172,7 @@ void InstructorsAndTraineesWidget::checkLoginResult(ServerAuthorization *serverA
 
         updateLabelLoggedInInstructor(serverAuth->Login, serverAuth->ClientName);
         connectorToServer->setLoginName(nameInstructorLoggedInLocal);
-        QMessageBox::information(this, tr("Instructor authorization"), tr("Successfully!"));
+        //QMessageBox::information(this, tr("Instructor authorization"), tr("Successfully!"));
     }
     else
     {
@@ -228,6 +228,9 @@ void InstructorsAndTraineesWidget::slot_ConnectedToServer(bool state)
 
         viewerTrainees->clearTree();
         viewerInstructors->clearTree();
+
+        ammTasksWidget->clearTree();
+        fimTasksWidget->clearTree();
     }
 }
 
@@ -304,6 +307,9 @@ void InstructorsAndTraineesWidget::on_btnAuthorizationInstructor_clicked()
 
                 viewerTrainees->clearTree();
                 viewerInstructors->clearTree();
+
+                ammTasksWidget->clearTree();
+                fimTasksWidget->clearTree();
             }
             else
                 ui->btnAuthorizationInstructor->setChecked(true);
diff --git a/InstructorsAndTrainees/tasks/ammtaskswidget.h b/InstructorsAndTrainees/tasks/ammtaskswidget.h
index 216f1b7..2a34414 100644
--- a/InstructorsAndTrainees/tasks/ammtaskswidget.h
+++ b/InstructorsAndTrainees/tasks/ammtaskswidget.h
@@ -25,6 +25,12 @@ public:
     explicit AMMtasksWidget(ConnectorToServer* connectorToServer, QWidget *parent = nullptr);
     ~AMMtasksWidget();
 
+public:
+    void clearTree()
+    {
+        treeWidget->clear();
+    }
+
 private Q_SLOTS:
     void on_treeWidget_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
     void on_btnUpdateTasks_clicked();
diff --git a/InstructorsAndTrainees/tasks/fimtaskswidget.h b/InstructorsAndTrainees/tasks/fimtaskswidget.h
index c55a1a2..3be156c 100644
--- a/InstructorsAndTrainees/tasks/fimtaskswidget.h
+++ b/InstructorsAndTrainees/tasks/fimtaskswidget.h
@@ -24,6 +24,12 @@ public:
     explicit FIMtasksWidget(ConnectorToServer* connectorToServer, QWidget *parent = nullptr);
     ~FIMtasksWidget();
 
+public:
+    void clearTree()
+    {
+        treeWidget->clear();
+    }
+
 private Q_SLOTS:
     void on_treeWidget_currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
     void on_btnUpdateTasks_clicked();