diff --git a/src/lib/3rdparty/ecwin7.cpp b/src/lib/3rdparty/ecwin7.cpp
index 2d124082e..ee921b14c 100644
--- a/src/lib/3rdparty/ecwin7.cpp
+++ b/src/lib/3rdparty/ecwin7.cpp
@@ -32,7 +32,7 @@ EcWin7::EcWin7()
 }
 
 // Init taskbar communication
-void EcWin7::init(WId wid)
+void EcWin7::init(HWND wid)
 {
     mWindowId = wid;
     mTaskbarMessageId = RegisterWindowMessage(L"TaskbarButtonCreated");
diff --git a/src/lib/3rdparty/ecwin7.h b/src/lib/3rdparty/ecwin7.h
index fc9fda615..5d72ce64a 100644
--- a/src/lib/3rdparty/ecwin7.h
+++ b/src/lib/3rdparty/ecwin7.h
@@ -27,7 +27,7 @@
 
 // Windows only data definitions
 #ifdef W7TASKBAR
-
+#define NOMINMAX
 #include <windows.h>
 #include <initguid.h>
 #define CMIC_MASK_ASYNCOK SEE_MASK_ASYNCOK
@@ -45,7 +45,7 @@ public:
 
     // Initialization methods
     EcWin7();
-    void init(WId wid);
+    void init(HWND wid);
     bool winEvent(MSG* message, long* result);
 
     // Overlay icon handling
@@ -63,7 +63,7 @@ public:
     void setProgressState(ToolBarProgressState state);
 
 private:
-    WId mWindowId;
+    HWND mWindowId;
     UINT mTaskbarMessageId;
     ITaskbarList3* mTaskbar;
     HICON mOverlayIcon;
diff --git a/src/lib/3rdparty/qtlockedfile_win.cpp b/src/lib/3rdparty/qtlockedfile_win.cpp
index bba7c7c5a..bd0f9979d 100644
--- a/src/lib/3rdparty/qtlockedfile_win.cpp
+++ b/src/lib/3rdparty/qtlockedfile_win.cpp
@@ -66,16 +66,24 @@ Qt::HANDLE QtLockedFile::getMutexHandle(int idx, bool doCreate)
 
     Qt::HANDLE mutex;
     if (doCreate) {
+#if (QT_VERSION < 0x050000)
         QT_WA( { mutex = CreateMutexW(NULL, FALSE, (TCHAR*)mname.utf16()); },
         { mutex = CreateMutexA(NULL, FALSE, mname.toLocal8Bit().constData()); });
+#else // QT_WA removed from Qt5: http://qt-project.org/forums/viewthread/22994/#107379
+        mutex = CreateMutexW(NULL, FALSE, (TCHAR*)mname.utf16());
+#endif
         if (!mutex) {
             qErrnoWarning("QtLockedFile::lock(): CreateMutex failed");
             return 0;
         }
     }
     else {
+#if (QT_VERSION < 0x050000)
         QT_WA( { mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, (TCHAR*)mname.utf16()); },
         { mutex = OpenMutexA(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, mname.toLocal8Bit().constData()); });
+#else // QT_WA removed from Qt5: http://qt-project.org/forums/viewthread/22994/#107379
+        mutex = OpenMutexW(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, (TCHAR*)mname.utf16());
+#endif
         if (!mutex) {
             if (GetLastError() != ERROR_FILE_NOT_FOUND) {
                 qErrnoWarning("QtLockedFile::lock(): OpenMutex failed");
diff --git a/src/lib/3rdparty/qtwin.cpp b/src/lib/3rdparty/qtwin.cpp
index 9a63b6a5e..40243e79c 100644
--- a/src/lib/3rdparty/qtwin.cpp
+++ b/src/lib/3rdparty/qtwin.cpp
@@ -84,7 +84,11 @@ public:
     void removeWidget(QWidget* widget) {
         widgets.removeAll(widget);
     }
+#if (QT_VERSION < 0x050000)
     bool winEvent(MSG* message, long* result);
+#else
+    bool nativeEvent(const QByteArray &eventType, void* _message, long* result);
+#endif
 
 private:
     QWidgetList widgets;
@@ -93,7 +97,7 @@ private:
 static bool resolveLibs()
 {
     if (!pDwmIsCompositionEnabled) {
-        QLibrary dwmLib(QString::fromAscii("dwmapi"));
+        QLibrary dwmLib(QString::fromLatin1("dwmapi"));
         pDwmIsCompositionEnabled = (PtrDwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled");
         pDwmExtendFrameIntoClientArea = (PtrDwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea");
         pDwmEnableBlurBehindWindow = (PtrDwmEnableBlurBehindWindow)dwmLib.resolve("DwmEnableBlurBehindWindow");
@@ -164,9 +168,13 @@ bool QtWin::enableBlurBehindWindow(QWidget* widget, bool enable)
         bb.fEnable = enable;
         bb.dwFlags = DWM_BB_ENABLE;
         bb.hRgnBlur = NULL;
+
         widget->setAttribute(Qt::WA_TranslucentBackground, enable);
         widget->setAttribute(Qt::WA_NoSystemBackground, enable);
-        hr = pDwmEnableBlurBehindWindow(widget->winId(), &bb);
+        // Qt5: setting WA_TranslucentBackground without the following line hides the widget!!
+        widget->setWindowOpacity(1);
+
+        hr = pDwmEnableBlurBehindWindow(hwndOfWidget(widget) , &bb);
         if (SUCCEEDED(hr)) {
             result = true;
             windowNotifier()->addWidget(widget);
@@ -202,16 +210,18 @@ bool QtWin::extendFrameIntoClientArea(QWidget* widget, int left, int top, int ri
     bool result = false;
 #ifdef Q_OS_WIN
     if (resolveLibs()) {
-        QLibrary dwmLib(QString::fromAscii("dwmapi"));
+        QLibrary dwmLib(QString::fromLatin1("dwmapi"));
         HRESULT hr = S_OK;
         MARGINS m = {left, right, top, bottom};
-        hr = pDwmExtendFrameIntoClientArea(widget->winId(), &m);
+        hr = pDwmExtendFrameIntoClientArea(hwndOfWidget(widget), &m);
         if (SUCCEEDED(hr)) {
             result = true;
             windowNotifier()->addWidget(widget);
             widgetsBlurState.insert(widget, true);
         }
         widget->setAttribute(Qt::WA_TranslucentBackground, result);
+        // Qt5: setting WA_TranslucentBackground without the following line hides the widget!!
+        widget->setWindowOpacity(1);
     }
 #endif
     return result;
@@ -230,7 +240,7 @@ QColor QtWin::colorizationColor()
     if (resolveLibs()) {
         DWORD color = 0;
         BOOL opaque = FALSE;
-        QLibrary dwmLib(QString::fromAscii("dwmapi"));
+        QLibrary dwmLib(QString::fromLatin1("dwmapi"));
         HRESULT hr = S_OK;
         hr = pDwmGetColorizationColor(&color, &opaque);
         if (SUCCEEDED(hr)) {
@@ -242,6 +252,16 @@ QColor QtWin::colorizationColor()
 }
 
 #ifdef Q_OS_WIN
+HWND QtWin::hwndOfWidget(const QWidget* widget)
+{
+    if (widget) {
+        return reinterpret_cast<HWND>(widget->winId());
+    }
+    else {
+        return 0;
+    }
+}
+
 WindowNotifier* QtWin::windowNotifier()
 {
     static WindowNotifier* windowNotifierInstance = 0;
@@ -253,8 +273,15 @@ WindowNotifier* QtWin::windowNotifier()
 
 
 /* Notify all enabled windows that the DWM state changed */
+#if (QT_VERSION < 0x050000)
 bool WindowNotifier::winEvent(MSG* message, long* result)
 {
+#else
+bool WindowNotifier::nativeEvent(const QByteArray &eventType, void* _message, long* result)
+{
+    Q_UNUSED(eventType)
+    MSG* message = static_cast<MSG*>(_message);
+#endif
     if (message && message->message == WM_DWMCOMPOSITIONCHANGED) {
         bool compositionEnabled = QtWin::isCompositionEnabled();
         foreach(QWidget * widget, widgets) {
@@ -270,7 +297,11 @@ bool WindowNotifier::winEvent(MSG* message, long* result)
             }
         }
     }
+#if (QT_VERSION < 0x050000)
     return QWidget::winEvent(message, result);
+#else
+    return QWidget::nativeEvent(eventType, _message, result);
+#endif
 }
 
 #ifdef W7API
diff --git a/src/lib/3rdparty/qtwin.h b/src/lib/3rdparty/qtwin.h
index 24903dfc4..c2b02d915 100644
--- a/src/lib/3rdparty/qtwin.h
+++ b/src/lib/3rdparty/qtwin.h
@@ -38,6 +38,8 @@
   * these functions will simply not do anything.
   */
 #ifdef Q_OS_WIN
+// Qt5 compile issue: http://comments.gmane.org/gmane.comp.lib.qt.user/4711
+#define NOMINMAX
 #ifdef W7API
 #include <ShlObj.h>
 #include <shlwapi.h>
@@ -62,6 +64,9 @@ public:
     static QColor colorizationColor();
 
     static void setupJumpList();
+#ifdef Q_OS_WIN
+    static HWND hwndOfWidget(const QWidget* widget);
+#endif
 
 private:
     static WindowNotifier* windowNotifier();
diff --git a/src/lib/app/qupzilla.cpp b/src/lib/app/qupzilla.cpp
index 5621143da..d8030fcc3 100644
--- a/src/lib/app/qupzilla.cpp
+++ b/src/lib/app/qupzilla.cpp
@@ -661,6 +661,8 @@ void QupZilla::loadSettings()
         m_usingTransparentBackground = true;
 
         applyBlurToMainWindow();
+        update();
+
         //install event filter
         menuBar()->installEventFilter(this);
         m_navigationBar->installEventFilter(this);
@@ -1998,8 +2000,15 @@ void QupZilla::moveToVirtualDesktop(int desktopId)
 #endif
 
 #ifdef Q_OS_WIN
+#if (QT_VERSION < 0x050000)
 bool QupZilla::winEvent(MSG* message, long* result)
 {
+#else
+bool QupZilla::nativeEvent(const QByteArray &eventType, void* _message, long* result)
+{
+    Q_UNUSED(eventType)
+    MSG* message = static_cast<MSG*>(_message);
+#endif
     if (message && message->message == WM_DWMCOMPOSITIONCHANGED) {
         Settings settings;
         settings.beginGroup("Browser-View-Settings");
@@ -2039,7 +2048,11 @@ bool QupZilla::winEvent(MSG* message, long* result)
             setUpdatesEnabled(true);
         }
     }
+#if (QT_VERSION < 0x050000)
     return QMainWindow::winEvent(message, result);
+#else
+    return QMainWindow::nativeEvent(eventType, _message, result);
+#endif
 }
 
 void QupZilla::applyBlurToMainWindow(bool force)
diff --git a/src/lib/app/qupzilla.h b/src/lib/app/qupzilla.h
index 44cb7f6ba..9f1b464b5 100644
--- a/src/lib/app/qupzilla.h
+++ b/src/lib/app/qupzilla.h
@@ -208,7 +208,11 @@ private:
     void disconnectObjects();
 
 #ifdef Q_OS_WIN
+#if (QT_VERSION < 0x050000)
     bool winEvent(MSG* message, long* result);
+#else
+    bool nativeEvent(const QByteArray &eventType, void* _message, long* result);
+#endif
     bool eventFilter(QObject* object, QEvent* event);
 #endif
 
diff --git a/src/lib/downloads/downloadmanager.cpp b/src/lib/downloads/downloadmanager.cpp
index 3285212f8..9b6dd89aa 100644
--- a/src/lib/downloads/downloadmanager.cpp
+++ b/src/lib/downloads/downloadmanager.cpp
@@ -58,7 +58,7 @@ DownloadManager::DownloadManager(QWidget* parent)
 
 #ifdef W7TASKBAR
     if (QtWin::isRunningWindows7()) {
-        win7.init(this->winId());
+        win7.init(QtWin::hwndOfWidget(this));
     }
 #endif
 }
@@ -116,8 +116,15 @@ void DownloadManager::startExternalManager(const QUrl &url)
 }
 
 #ifdef W7TASKBAR
+#if (QT_VERSION < 0x050000)
 bool DownloadManager::winEvent(MSG* message, long* result)
 {
+#else
+bool DownloadManager::nativeEvent(const QByteArray &eventType, void* _message, long* result)
+{
+    Q_UNUSED(eventType)
+    MSG* message = static_cast<MSG*>(_message);
+#endif
     return win7.winEvent(message, result);
 }
 #endif
diff --git a/src/lib/downloads/downloadmanager.h b/src/lib/downloads/downloadmanager.h
index aadd23778..8fd4a9887 100644
--- a/src/lib/downloads/downloadmanager.h
+++ b/src/lib/downloads/downloadmanager.h
@@ -80,7 +80,11 @@ public slots:
 
 #ifdef W7TASKBAR
 protected:
+#if (QT_VERSION < 0x050000)
     virtual bool winEvent(MSG* message, long* result);
+#else
+    virtual bool nativeEvent(const QByteArray &eventType, void* _message, long* result);
+#endif
 #endif
 
 private slots: