ParticleSystem not work when lock & unlock the desktop

I'm using ParticleSystem. I'm on Windows XP. Lock the desktop(Win+L), then unlock the desktop, then the following error will be repeatedly printed to the Output (at a very fast speed):

QOpenGLContext::swapBuffers() called without corresponding makeCurrent()
QEGLPlatformContext::swapBuffers(): eglError: 12302, this: 0x21daa40

bool __thiscall QWindowsEGLContext::makeCurrent(class QPlatformSurface *): eglMakeCurrent() failed, eglError: 0x300e, this: 0x21daa40

Meanwhile the window area belongs to my program will not refresh. It remains the background of the desktop

Here is my code: (In fact, ALL the particle examples have the same problem)

• I've also tested on Windows 7, it works well. *

import QtQuick 2.0
import QtQuick.Particles 2.0	
	
Rectangle {
	width: 1000
	height: 800
	color: "grey"

	ParticleSystem{
		id: particles
	}
	ImageParticle{
		anchors.fill: parent
		system: particles
		source: "pics/particle.png"
		colorVariation: 0.6
	}

	Emitter{
		anchors.fill: parent
		system: particles
		emitRate: 5
		lifeSpan: 2000
		size: 5
		sizeVariation: 2

		acceleration: AngleDirection { angle: 90; angleVariation: 360; magnitude: 20; }
		velocity: AngleDirection { angle: -90; angleVariation: 360; magnitude: 10; }
	}
}

And is it related to https://bugreports.qt-project.org/browse/QTBUG-30158 ?