diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index a3797682a3..c239aedb05 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -911,7 +911,8 @@ void QCocoaWindow::clearNSWindow(NSWindow *window)
     [window setContentView:nil];
     [window setDelegate:nil];
     [window clearPlatformWindow];
-    [[NSNotificationCenter defaultCenter] removeObserver:m_contentView];
+    [[NSNotificationCenter defaultCenter] removeObserver:m_contentView
+                                          name:nil object:window];
 }
 
 // Returns the current global screen geometry for the nswindow associated with this window.
@@ -1023,7 +1024,7 @@ qreal QCocoaWindow::devicePixelRatio() const
 
 void QCocoaWindow::exposeWindow()
 {
-    if (!m_isExposed) {
+    if (!m_isExposed && ![[m_contentView superview] isHidden]) {
         m_isExposed = true;
         QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry()));
     }
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index c6dce8b6f6..c2ffe96f8c 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -107,12 +107,9 @@ static QTouchDevice *touchDevice = 0;
     m_maskImage = 0;
     m_maskData = 0;
     m_window = 0;
-    if (m_subscribesForGlobalFrameNotifications) {
-        m_subscribesForGlobalFrameNotifications = false;
-        [[NSNotificationCenter defaultCenter] removeObserver:self
-             name:NSViewGlobalFrameDidChangeNotification
-             object:self];
-}
+    m_subscribesForGlobalFrameNotifications = false;
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+
     delete currentCustomDragTypes;
 
     [super dealloc];