diff --git a/LibInstructorsAndTrainees/resources/icons/updateVersion.png b/LibInstructorsAndTrainees/resources/icons/updateVersion.png
index 6b42dfe..32d9b55 100644
Binary files a/LibInstructorsAndTrainees/resources/icons/updateVersion.png and b/LibInstructorsAndTrainees/resources/icons/updateVersion.png differ
diff --git a/LibInstructorsAndTrainees/tasks/dialogchekertask.cpp b/LibInstructorsAndTrainees/tasks/dialogchekertask.cpp
index 5fed614..351abf5 100644
--- a/LibInstructorsAndTrainees/tasks/dialogchekertask.cpp
+++ b/LibInstructorsAndTrainees/tasks/dialogchekertask.cpp
@@ -29,6 +29,8 @@ DialogChekerTask::DialogChekerTask(ConnectorToServer* connectorToServer, Checker
         break;
     }
 
+    this->setWindowFlags(windowFlags() & ~Qt::WindowMinimizeButtonHint);
+
     this->setModal(true);
 }
 
diff --git a/LibInstructorsAndTrainees/tasks/dialoglistsubproc.cpp b/LibInstructorsAndTrainees/tasks/dialoglistsubproc.cpp
index d9ee0ec..fe91b58 100644
--- a/LibInstructorsAndTrainees/tasks/dialoglistsubproc.cpp
+++ b/LibInstructorsAndTrainees/tasks/dialoglistsubproc.cpp
@@ -15,6 +15,7 @@ DialogListSubProc::DialogListSubProc(QWidget *parent) :
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->addWidget(listSubProcCtrl);
     this->setWindowTitle(tr("List subprocedures"));
+    this->setWindowFlags(windowFlags() & ~Qt::WindowMinimizeButtonHint);
 
     this->setMinimumSize(1400, 700);
     this->setModal(true);
diff --git a/LibInstructorsAndTrainees/tasks/listsubproc.ui b/LibInstructorsAndTrainees/tasks/listsubproc.ui
index 7fe6668..069a0ec 100644
--- a/LibInstructorsAndTrainees/tasks/listsubproc.ui
+++ b/LibInstructorsAndTrainees/tasks/listsubproc.ui
@@ -73,7 +73,7 @@
          </property>
          <property name="icon">
           <iconset resource="../InstructorsAndTrainees.qrc">
-           <normaloff>:/resources/icons/circleGreen.png</normaloff>:/resources/icons/circleGreen.png</iconset>
+           <normaloff>:/resources/icons/assignTask.png</normaloff>:/resources/icons/assignTask.png</iconset>
          </property>
          <property name="iconSize">
           <size>
diff --git a/LibInstructorsAndTrainees/trainees/dialogcardtrainee.cpp b/LibInstructorsAndTrainees/trainees/dialogcardtrainee.cpp
index 451d926..5cf3191 100644
--- a/LibInstructorsAndTrainees/trainees/dialogcardtrainee.cpp
+++ b/LibInstructorsAndTrainees/trainees/dialogcardtrainee.cpp
@@ -18,6 +18,7 @@ DialogCardTrainee::DialogCardTrainee(ConnectorToServer* connectorToServer, Messa
     this->setWindowTitle(tr("Personal card trainee"));
     this->setMinimumSize(1600, 800);
     this->setWindowState(Qt::WindowMaximized);
+    this->setWindowFlags(windowFlags() & ~Qt::WindowMinimizeButtonHint);
     this->setModal(true);
 }
 
diff --git a/LibServer/resources/icons/stop.png b/LibServer/resources/icons/stop.png
index 9cd06dc..f136d39 100644
Binary files a/LibServer/resources/icons/stop.png and b/LibServer/resources/icons/stop.png differ