diff --git a/selfdrive/car/tests/test_models.py b/selfdrive/car/tests/test_models.py
index 444274d729..30ba12cc9e 100755
--- a/selfdrive/car/tests/test_models.py
+++ b/selfdrive/car/tests/test_models.py
@@ -121,6 +121,10 @@ class TestCarModelBase(unittest.TestCase):
     assert cls.CP
     assert cls.CP.carFingerprint == cls.car_model
 
+  @classmethod
+  def tearDownClass(cls):
+    del cls.can_msgs
+
   def setUp(self):
     self.CI = self.CarInterface(self.CP, self.CarController, self.CarState)
     assert self.CI
diff --git a/tools/cabana/chartswidget.cc b/tools/cabana/chartswidget.cc
index 21fd71b8ea..56346c6d6e 100644
--- a/tools/cabana/chartswidget.cc
+++ b/tools/cabana/chartswidget.cc
@@ -402,10 +402,13 @@ void ChartView::mouseReleaseEvent(QMouseEvent *event) {
       // zoom in if selected range is greater than 0.5s
       emit zoomIn(min, max);
     }
+    event->accept();
   } else if (event->button() == Qt::RightButton) {
     emit zoomReset();
+    event->accept();
+  } else {
+    QGraphicsView::mouseReleaseEvent(event);
   }
-  event->accept();
 }
 
 void ChartView::mouseMoveEvent(QMouseEvent *ev) {