Qt 5.9.9 Known Issues

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All platforms

  • Check that your system meets Qt's requirements
  • All open issues can be found from Jira: https://bugreports.qt.io
    • RTA findings for Qt 5.9.9 here
  • Old qt-unified-online-installer-3.0.1 (or older) can't any more be used to get Qt 5.9.4 (or later releases), see QTBUG-65798
    • For new installations use newest online installer. For existing installations please update maintenance tool at first.
  • Widevine support in QtWebEngine requires a widevine plugin from Chrome 61 or older, 62+ has a different ABI.


  • Static builds of Qt with Microsoft Visual Studio 2017 (through Update 2) do not work and will likely crash at runtime. This is believed to be a compiler bug and therefore an update from Microsoft is required. See https://bugreports.qt.io/browse/QTBUG-59721.


  • Building Qt modules fails with binaries delivered with online installer see bug QTBUG-52501. Workaround is to build whole Qt from source or have libicu 56 installed on the system.


  • Building for iOS-simulator fails with Xcode 10.0, see QTBUG-71313
    • workaround: add QMAKE_IOS_DEPLOYMENT_TARGET=9.0 to the pro file, or to use an earlier Xcode version.




  • Some example crashes
    • QTBUG-67175 - Scxml examples crashing after launch on UWP
    • QTBUG-67568 - [WinRT] 'computegles31' example crashes on WinRT
    • QTBUG-67566 - [WinRT] 'factorial' example crashes on WinRT
    • QTBUG-67565 - [WinRT] Quick player example crashes on WinRT



Qt for Device Creation