EDIT2: I have attached the output of qtdiag. The latest I have seen this problem is the 5.4 release - qt-opensource-windows-x86-msvc2013_64-5.4.0.exe

EDIT: I have attached three separate computer's display driver details which all exhibit the same problem.

If you have:

Rectangle {
       SequentialAnimation on rotation {
           loops: Animation.Infinite
           PropertyAnimation { duration: 1000; from: 0; to: 360 }
       }
}

and have the window open and visible, and then shut your laptop and reopen (i.e. go to sleep and resume), your entire qt application window will go black (not just the QQuickWidget!)

Attached is a sample project which illustrates this behaviour.

• Only tested on windows 8.1, windows 7.