QGLWidgets in a QSplitter cause white artifacts when resized on Windows

QHBoxLayout * layout = new QHBoxLayout();
QSplitter *splitter = new QSplitter(parent);
wdgt1 = new QGLWidget();
wdgt2 = new QGLWidget();
wdgt3 = new QGLWidget();
wdgt4 = new QGLWidget();
splitter->addWidget(wdgt1);
splitter->addWidget(wdgt2);
splitter->addWidget(wdgt3);
splitter->addWidget(wdgt4);

layout->addWidget(splitter);